Atomic MacOS Stealer - FileGrabber Activity

 1title: Atomic MacOS Stealer - FileGrabber Activity
 2id: e710a880-1f18-4417-b6a0-b5afdf7e33da
 3related:
 4    - id: e710a880-1f18-4417-b6a0-b5afdf7e305a
 5      type: obsolete
 6status: experimental
 7description: |
 8        Detects suspicious activity associated with Atomic MacOS Stealer (Amos) campaigns, including execution of FileGrabber and curl-based POST requests used for data exfiltration. The rule identifies either the execution of FileGrabber targeting /tmp or the use of curl to POST sensitive user data (including files such as /tmp/out.zip) to remote servers, which are key indicators of Amos infostealer activity.
 9references:
10    - https://www.trendmicro.com/en_us/research/25/i/an-mdr-analysis-of-the-amos-stealer-campaign.html
11    - https://hunt.io/blog/macos-clickfix-applescript-terminal-phishing
12    - https://github.com/bobby-tablez/TTP-Threat-Feeds/blob/45398914e631f8372c3a9fbcd339ff65ffff1b17/results/2025/10/20251001-161956-trendmicro-atomic-macos-stealer-(amos).yml#L36
13    - https://www.jamf.com/blog/infostealers-pose-threat-to-macos/
14author: Jason Phang Vern - Onn, Robbin Ooi Zhen Heng (Gen Digital)
15date: 2025-11-22
16tags:
17    - attack.execution
18    - attack.t1059.002
19    - detection.emerging-threats
20logsource:
21    category: process_creation
22    product: macos
23detection:
24    selection_curl_post:
25        CommandLine|contains|all:
26            - 'curl'
27            - 'POST'
28            - 'user:'
29            - '-H '
30            - 'BuildID'
31            - 'file=@/tmp/out.zip'
32            - 'cl: 0'
33    selection_filegrabber_exec:
34        CommandLine|contains|all:
35            - 'FileGrabber'
36            - '/tmp'
37    condition: 1 of selection_*
38falsepositives:
39    - Unknown
40level: high

References

• An MDR Analysis of the AMOS Stealer Campaign Targeting macOS via Cracked Apps

  

  Trend™ Research analyzed a campaign distributing Atomic macOS Stealer (AMOS), a malware family targeting macOS users. Attackers disguise the malware as “cracked” versions of legitimate apps, luring users into installation.

  
  Read More

• Clickfix on macOS: AppleScript Stealer, Terminal Phishing, and C2 Infrastructure

  

  Phishing campaign targets macOS with fake prompts that run AppleScript via terminal, stealing wallets, cookies, and sensitive files.

  
  Read More

• TTP-Threat-Feeds/results/2025/10/20251001-161956-trendmicro-atomic-macos-stealer-(amos).yml at 45398914e631f8372c3a9fbcd339ff65ffff1b17 · bobby-tablez/TTP-Threat-Feeds

  

  Threat feeds designed to extract adversarial TTPs and IOCs, using: ✨AI✨ - bobby-tablez/TTP-Threat-Feeds

  
  Read More

• Jamf Threat Labs dissects infostealer malware

  

  Learn more about how malicious threats continue to target macOS users, compromising their Macs and exfiltrating their data.

  
  Read More

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