Protecting Your macOS Device From Atomic macOS Stealer Malware- AMOS Malware


It is a known fact that Apple is growing its market in smartphones to mac books by releasing powerful exciting and more productive products over the years. This made threat actors create more malware programs to target Apple’s products. If you have been following cybersecurity blogs or intelligence for a year, MacStealer, RustBucket, and DazzleSpy are a few good examples, which show how threat actors are actively working on macOS exploits. There is a new addition to this list. Atomic macOS Stealer Malware (AMOS Malware).

 

Cyble Research and Intelligence Labs (CRIL) recently uncovered a Telegram channel promoting a new information-stealing malware, dubbed Atomic macOS Stealer (AMOS). This malware is specifically engineered to target macOS users and pilfer sensitive information from their devices. The research team also reveals that the authors of this information stealer are kept on sale on a telegram channel for a hefty price of $1,000 per month. Let’s dive deep into this report published by Cyble Research and Intelligence Labs.

Capabilities of the Atomic macOS Stealer Malware

Before we start the technical details, let’s see what the information stealer can do. AMOS is engineered to extract a wide array of information from compromised devices.

  1. Keychain passwords
  2. Comprehensive system information
  3. Files from the desktop and documents folder
  4. macOS password
Keychain password extraction by AMOS Malware

(Source: cyble.com) Keychain password extraction

According to Cyble researchers, the Atomic macOS Stealer malware is also capable of extracting information such as auto-fill data, passwords, cookies, wallets, and credit card information from multiple web browsers and various cryptocurrency wallets, including Atomic, Binance, Coinomi, Electrum, and Exodus. Moreover, the developers provide threat actors with a ready-to-use web panel for efficiently managing their victims.

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Authors of the Atomic macOS Stealer malware are consistently refining the malware, introducing new capabilities to enhance its effectiveness. The most recent update to the malware was publicized on April 25th via a Telegram post, showcasing its latest features. This move has made the malware an even more dangerous threat not only for macOS users but for crypto-wallet users too.

What Atomic macOS Stealer Malware Promised to Sell to Their Clients (Threat Actors)?

Authors of the Atomic macOS Stealer malware offer these services to their clients for the cost of $1000 per month.

  1. A web panel for managing victims
  2. MetaMask brute-forcing for stealing seed and private keys
  3. Crypto checker
  4. DMG installer

After successfully infiltrating a victim’s device, the TA shares the stolen data logs via Telegram.

Deceptive Delivery and Infiltration Techniques

As per the technical details shared by CRIL, The Atomic macOS Stealer disguises itself as an unsigned disk image file (Setup.dmg). Once executed, the malware prompts the victim to enter their system password on a fake prompt. This tactic, also employed by MacStealer, allows the malware to escalate privileges and perform its malicious activities.

 

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If you want to know about the infiltration technique, researchers say that the infiltration technique still remains unclear. However, it is likely that users are tricked into downloading and executing the malicious software, believing it to be legitimate. For instance, the Atomic stealer artifact discovered on VirusTotal on April 24, 2023, was named “Notion-7.0.6.dmg,” masquerading as the popular note-taking app. Other samples found by the MalwareHunterTeam were distributed as “Photoshop CC 2023.dmg” and “Tor Browser.dmg.” All that matters is the delivery of the malware, it doesn’t matter either by exploiting system vulnerabilities or served by phishing websites or emails.

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Data Exfiltration and Transmission Process

Exfiltrated data

(Source: cyble.com) Exfiltrated data

Upon successful infiltration, Atomic macOS Stealer proceeds to gather system metadata, files, iCloud Keychain, and information stored in web browsers (e.g., passwords, autofill, cookies, credit card data) and crypto wallet extensions. The collected data is compressed into a ZIP archive and transmitted to a remote server hxxp[:]//amos-malware[.]ru/sendlog by encoding the ZIP file in Base64 format. The ZIP file containing the compiled information is then forwarded to pre-configured Telegram channels. Please read the complete technical analysis here.

Collected system information by Atomic macOS Stealer Malware

(Source: cyble.com) Collected system information

How to Protect Your macOS Device From Atomic macOS Stealer Malware?

To fortify your defenses against cyber threats like the Atomic macOS Stealer malware, it is crucial to follow a set of cybersecurity best practices. These proactive measures create a robust first line of defense against attackers and help ensure the safety of your data and devices. Below is a list of recommended best practices for macOS users:

  1. Download software from trusted sources: Always download and install software from the official Apple App Store to minimize the risk of installing malicious applications.
  2. Invest in reputable security software: Use a reliable antivirus and internet security software package to protect your system from malware and other threats.
  3. Create strong passwords and enable multi-factor authentication: Use unique, complex passwords for all your accounts and enable multi-factor authentication wherever possible to add an extra layer of security.
  4. Utilize biometric security features: Enable biometric security features, such as fingerprint or facial recognition, to unlock your device and add another layer of protection.
  5. Exercise caution with email links: Be cautious when opening links received via email, especially if they are from unknown senders, as these could be phishing attempts or lead to malicious websites.
  6. Manage permissions carefully: Be mindful when granting permissions to apps and websites, ensuring that you only give access to essential features and services.
  7. Keep your devices and software updated: Regularly update your devices, operating systems, and applications to patch vulnerabilities and improve overall security.
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By adhering to these cybersecurity best practices, macOS users can significantly enhance their protection against cyber threats and minimize the risk of falling victim to attackers.

Corporate companies should collect all the IOCs and block them on their all perimeter security devices. If possible, conduct an audit or scan for the persistence of the malware file or network communication.

MITRE ATT&CK® Techniques

Tactic Technique ID Technique Name
Execution T1204.002 User Execution: Malicious File
Credential Access T1110 Brute Force
Credential Access T1555.001 Keychain
Credential Access T1555.003 Credentials from Web Browsers
Discovery T1083 File and Directory Discovery
Command and Control T1132.001 Data Encoding: Standard Encoding
Exfiltration T1041 Exfiltration Over C&C Channel

Indicator of Compromise:

Crypto Wallet Extension

The table below lists the crypto wallets with respective browser extension IDs targeted by the malware.

 

See Also Understanding Indicator Of Compromise (IoC)

acmacodkjbdgmoleebolmdjonilkdbch Rabby Wallet
aeachknmefphepccionboohckonoeemg Coin98 Wallet
afbcbjpbpfadlkmhmclhkeeodmamcflc Math Wallet
aholpfdialjgjfhomihkjbmgjidlcdno Exodus Web3 Wallet
aiifbnbfobpmeekipheeijimdpnlpgpp Station Wallet
amkmjjmmflddogmhpjloimipbofnfjih Wombat – Gaming Wallet for Ethereum & EOS
apnehcjmnengpnmccpaibjmhhoadaico CWallet
bcopgchhojmggmffilplmbdicgaihlkp Hycon Lite Client
bfnaelmomeimhlpmgjnjophhpkkoljpa Phantom
bocpokimicclpaiekenaeelehdjllofo XDCPay
cgeeodpfagjceefieflmdfphplkenlfk EVER Wallet
cihmoadaighcejopammfbmddcmdekcje LeafWallet
cjelfplplebdjjenllpjcblmjkfcffne Jaxx Liberty
cjmkndjhnagcfbpiemnkdpomccnjblmj Finnie
cmndjbecilbocjfkibfbifhngkdmjgog Swash
cnmamaachppnkjgnildpdmkaakejnhae Auro
copjnifcecdedocejpaapepagaodgpbh Freaks Axie
cphhlgmgameodnhkjdmkpanlelnlohao NeoLine
dhgnlgphgchebgoemcjekedjjbifijid Crypto Airdrops & Bounties
dkdedlpgdmmkkfjabffeganieamfklkm Cyano
dmkamcknogkgcdfhhbddcghachkejeap Keplr
efbglgofoippbgcjepnhiblaibcnclgk Martian Wallet for Sui & Aptos
egjidjbpglichdcondbcbdnbeeppgdph Trust Wallet
ffnbelfdoeiohenkjibnmadjiehjhajb Yoroi
fhbohimaelbohpjbbldcngcnapndodjp BinanceChain
fhilaheimglignddkjgofkcbgekhenbh Oxygen
flpiciilemghbmfalicajoolhkkenfel ICONex
fnjhmkhhmkbjkkabndcnnogagogbneec Ronin
fnnegphlobjdpkhecapkijjdkgcjhkib Harmony Wallet
hcflpincpppdclinealmandijcmnkbgn KHC
hmeobnfnfcmdkdcmlblgagmfpfboieaf XDEFI
hnfanknocfeofbddgcijnmhnfnkdnaad Coinbase
hnhobjmcibchnmglfbldbfabcgaknlkj Flint Wallet
hpglfhgfnhbgpjdenjgmdgoeiappafln Guarda
ibnejdfjmmkpcnlpebklmnkoeoihofec TronLink
imloifkgjagghnncjkhggdhalmcnfklk Trezor Password Manager
jojhfeoedkpkglbfimdfabpdfjaoolaf Polymesh
klnaejjgbibmhlephnhpmaofohgkpgkd ZilPay
kncchdigobghenbbaddojjnnaogfppfj iWallet
kpfopkelmapcoipemfendmdcghnegimn Liquality
lodccjjbdhfakaekdiahmedfbieldgik DAppPlay
mfhbebgoclkghebffdldpobeajmbecfk Starcoin
mnfifefkajgofkcjkemidiaecocnkjeh TezBox
nhnkbkgjikgcigadomkphalanndcapjk CLW
nkbihfbeogaeaoehlefnkodbefgpgknn Metamask
nknhiehlklippafakaeklbeglecifhad Nabox
nlbmnnijcnlegkjjpcfjclmcfggfefdm MewCx
nlgbhdfgdhgbiamfdfmbikcdghidoadd Byone
nphplpgoakhhjchkkhmiggakijnkhfnd Ton
ookjlbkiijinhpmnjffcofjonbfbgaoc Temple
pdadjkfkgcafgbceimcpbkalnfnepbnk KardiaChain
pnndplcbkakcplkjnolgbkdgjikjednm Tron Wallet & Explorer – Tronium
pocmplpaccanhmnllbbkpgfliimjljgo Slope
ppdadbejkmjnefldpcdjhnkpbjkikoip Oasis

Command and Control (C&C)

  • hxxp[:]//amos-malware[.]ru/sendlog
  • amos-malware[.]ru

Setup.dmg

  • 5e0226adbe5d85852a6d0b1ce90b2308
  • 0a87b12b2d12526c8ba287f0fb0b2f7b7e23ab4a
  • 15f39e53a2b4fa01f2c39ad29c7fe4c2fef6f24eff6fa46b8e77add58e7ac709

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