Suspicious File Downloaded From File-Sharing Website Via Certutil.EXE

 1title: Suspicious File Downloaded From File-Sharing Website Via Certutil.EXE
 2id: 42a5f1e7-9603-4f6d-97ae-3f37d130d794
 3related:
 4    - id: 19b08b1c-861d-4e75-a1ef-ea0c1baf202b # Direct IP download
 5      type: similar
 6    - id: 13e6fe51-d478-4c7e-b0f2-6da9b400a829 # Generic download
 7      type: similar
 8status: experimental
 9description: Detects the execution of certutil with certain flags that allow the utility to download files from file-sharing websites.
10references:
11    - https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/certutil
12    - https://forensicitguy.github.io/agenttesla-vba-certutil-download/
13    - https://news.sophos.com/en-us/2021/04/13/compromised-exchange-server-hosting-cryptojacker-targeting-other-exchange-servers/
14    - https://twitter.com/egre55/status/1087685529016193025
15    - https://lolbas-project.github.io/lolbas/Binaries/Certutil/
16    - https://www.microsoft.com/en-us/security/blog/2024/01/17/new-ttps-observed-in-mint-sandstorm-campaign-targeting-high-profile-individuals-at-universities-and-research-orgs/
17author: Nasreddine Bencherchali (Nextron Systems)
18date: 2023/02/15
19modified: 2024/02/09
20tags:
21    - attack.defense_evasion
22    - attack.t1027
23logsource:
24    category: process_creation
25    product: windows
26detection:
27    selection_img:
28        - Image|endswith: '\certutil.exe'
29        - OriginalFileName: 'CertUtil.exe'
30    selection_flags:
31        CommandLine|contains:
32            - 'urlcache '
33            - 'verifyctl '
34    selection_http:
35        CommandLine|contains:
36            - '.githubusercontent.com'       # Includes both gists and github repositories / Michael Haag (idea)
37            - 'anonfiles.com'
38            - 'cdn.discordapp.com'
39            - 'cdn.discordapp.com/attachments/'
40            - 'ddns.net'
41            - 'dl.dropboxusercontent.com'
42            - 'ghostbin.co'
43            - 'glitch.me'
44            - 'gofile.io'
45            - 'hastebin.com'
46            - 'mediafire.com'
47            - 'mega.nz'
48            - 'onrender.com'
49            - 'paste.ee'
50            - 'pastebin.com'
51            - 'pastebin.pl'
52            - 'pastetext.net'
53            - 'privatlab.com'
54            - 'privatlab.net'
55            - 'send.exploit.in'
56            - 'sendspace.com'
57            - 'storage.googleapis.com'
58            - 'storjshare.io'
59            - 'supabase.co'
60            - 'temp.sh'
61            - 'transfer.sh'
62            - 'ufile.io'
63    condition: all of selection_*
64falsepositives:
65    - Unknown
66level: high

References

• certutil

  

  Learn about certutil, a command-line program that displays CA configuration information, configures Certificate Services, and backs up and restores CA components.

  
  Read More

• An AgentTesla Sample Using VBA Macros and Certutil

  AgentTesla is a .NET stealer that adversaries commonly buy and combine with other malicious products for deployment. In this post I’m tearing into a XLSM document that downloads and executes further AgentTesla malware. If you want to follow along at home, the sample is available in MalwareBazaar here: https://bazaar.abuse.ch/sample/d1c616976e917d54778f587a2550ee5568a72b661d5f04e68d194ce998864d84/.

  
  Read More

• Compromised Exchange server hosting cryptojacker targeting other Exchange servers

  

  An ouroboros of malicious cryptominers takes advantage of the ProxyLogon exploit

  
  Read More

• Something went wrong, but don’t fret — let’s give it another shot.

  
  Read More

• Certutil | LOLBAS

  Download and save 7zip to disk in the current folder. certutil.exe -urlcache -split -f http://7-zip.org/a/7z1604-x64.exe 7zip.exe Use caseDownload file from Internet Privileges requiredUser Operati...

  
  Read More

• https://www.microsoft.com/en-us/security/blog/2024/01/17/new-ttps-observed-in-mint-sandstorm-campaign-targeting-high-profile-individuals-at-universities-and-research-orgs/

  
  Read More

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