MALICIOUS — 46b4995654c4fb5f1be2a865481392ca98c1a794b445b0dbd3734182e933b488
MALICIOUS — 46b4995654c4fb5f1be2a865481392ca98c1a794b445b0dbd3734182e933b488 is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (100/100), attributed to the Brontok family. 6 of 55 detection engines flagged it, exhibiting 9 ATT&CK techniques.
Identification
- SHA-256:
46b4995654c4fb5f1be2a865481392ca98c1a794b445b0dbd3734182e933b488 - SHA-1:
0e468ec436c0116d079d99a775a6d86c7de2585b - MD5:
8373f4d6d5993debe4983739bf63c196 - imphash:
c9e5da681f1b2c58366ed7090f83e56a - ssdeep:
768:5e9OQw/ecT3Vb3h8WTVIat6oHB+3O9iMeCni2caS7NVosuvt5BMCoR:5e9nw/hT31GCSI6WB3IMeCn7EI50R - TLSH:
T118329D3F33F5A610DFE3D6242FA5C19C0A89136AF80DA50195DE56880C46B37B926F27 - Submitted as: 46b4995654c4fb5f1be2a865481392ca98c1a794b445b0dbd3734182e933b488
- File type: pe · Size: 45120 bytes
- Verdict: malicious (100/100) · Family: Brontok
Detections (6 of 55 engines)
- MalwareAnalyser heuristics (entropy/packer): high-entropy-sections:g=eg=e
- ClamAV (daily): Win.Worm.Brontok-11
- Detect It Easy (packer/type): DIE:Microsoft Linker
- Microsoft Defender: Worm:Win32/Brontok.BJ@mm
- Emsisoft (Emergency Kit): Dump:Win32.Worm.Brontok.AM
- Kaspersky (KVRT): Email-Worm.Win32.Brontok.n
MITRE ATT&CK
Why this verdict
The malicious score of 100/100 is the fusion of 12 weighted signals:
- ClamAV (daily) flagged Win.Worm.Brontok-11 (rule
Win.Worm.Brontok-11) - engine signal, weight 0.90, confidence 0.95 - 4 behavioral detection(s): Credential Access: LSASS memory access [critical] (rule
tl-cred-lsass) - dynamic signal, weight 0.80, confidence 0.90 - Memory forensics: 2 finding(s), e.g. SSDT hook (rule
windows.ssdt.SSDT) - memory signal, weight 0.50, confidence 0.85 - Observed at runtime: Registry Run Key Persistence (T1547.001) (rule
Registry Run Key Persistence) - dynamic signal, weight 0.40, confidence 0.90 - Observed at runtime: Windows Service (T1543.003) (rule
Windows Service) - dynamic signal, weight 0.40, confidence 0.90 - Contacted 22 external host(s) at runtime (22 HTTP) - network signal, weight 0.40, confidence 0.80
- Anti-analysis: T1497, T1497.001, T1082, T1622 - dynamic signal, weight 0.40, confidence 0.75
- Detect It Easy (packer/type) flagged DIE:Microsoft Linker (rule
DIE:Microsoft Linker) - engine signal, weight 0.35, confidence 0.70 - communicate over HTTP (rule
communicate over HTTP) - capa signal, weight 0.30, confidence 0.60 - Packing/obfuscation: high-entropy-sections:g=eg=e, Microsoft Linker - static signal, weight 0.25, confidence 0.55
- Dropped 2 executable file(s) at runtime - dynamic signal, weight 0.20, confidence 0.60
- Observed at runtime: Modify Registry (T1112) (rule
Modify Registry) - dynamic signal, weight 0.12, confidence 0.90
Dynamic analysis (windows)
126034 behavior events · 3 ATT&CK techniques · 5 dropped files.
Runtime network
- www.msftconnecttest.com
- rb.symcd.com
- rb.symcb.com
- inference.location.live.net
- to-do.office.com
- staging.to-do.officeppe.com
- teams.cloud.microsoft
- outlook.office.com
- outlook.office365.com
- outlook.cloud.microsoft
- ctldl.windowsupdate.com
- login.live.com
- ocsp.digicert.com
- desktop-hsgcbep
- v20.events.data.microsoft.com
- config.edge.skype.com
- windows.msn.com
- oneocsp.microsoft.com
- www.msn.com
- settings-win.data.microsoft.com
Dropped files
- C:\Users\analyst\AppData\Local\jalak-931560615-bali.com -
bd6537a739cdb86537897d6f1f5c17665e820a40d0c554873e66d98e82a3299d - C:\Windows\System32\Drivers\etc\hosts -
15f5a8d0fb8d1a18698f36d5bee5ae7549448a87767841c402f3096b788bdc15 - C:\Windows\System32\s6939\domlist.txt -
b44c505b721e93e2a596577018cc65b993cd632b9fe7620a4b3db54031afff5d - C:\Users\analyst\AppData\Local\dv6156060x\yesbron.com -
4dfd39af80ef6321c6d77be240a054cad2d915d9516703c6ef4aaf0cc32874d5 - C:\Windows\System32\s6939\Spread.Mail.Bro\blaine.bublitz@gmail.com.ini -
99ccee855344cf60144a9dc813a7cda6e7e87acb55dfd04195f5dc22c5d5416b
Embedded URLs
- http://www.msftconnecttest.com/connecttest.txt
- http://rb.symcd.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTDRSYViRCZTxmZjLENmnwVjLly9QQU1MAGIknrOUvdk%2BJcobhHdglyA1gCEF0QyxjrOnkAh4OrdHf50xk%3D
- http://rb.symcb.com/rb.crl
- http://203.26.79.13/filestreamingservice//files/fa5c4269-9d03-4a47-8d97-be6931f0b22c/pieceshash?cacheHostOrigin=dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice/files/fa5c4269-9d03-4a47-8d97-be6931f0b22c?P1=1787925999&P2=404&P3=2&P4=Sum4H6VySRiB0IR%2b3VvnSjZAySHM%2b2h6DCkPuhmpv2nVR8%2bYr%2b4kwQN6YE0ssPsj1TrKigKdw4OkXbyPBmHoAQ%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice//files/51d86688-616b-47e3-abeb-3df16a1583c5/pieceshash?cacheHostOrigin=dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice/files/51d86688-616b-47e3-abeb-3df16a1583c5?P1=1787926102&P2=404&P3=2&P4=T750H2rnhsPyxPYADbBHpNHJ14dsmD4z%2fg4KMXNoxJtVlaC2jUf%2bM6idthpZTRe7dL0kssj7cvi4jHogX4%2fk3g%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
Embedded IP addresses
- 20.42.65.84
- 20.42.179.192
- 4.230.171.124
- 20.247.184.142
- 74.178.76.128
- 4.150.223.100
- 74.178.240.51
- 20.236.44.162
- 52.123.129.14
- 52.123.128.14
- 20.42.65.94
- 172.178.240.163
- 52.123.252.241
- 52.148.114.188
- 203.26.79.13
- 135.234.160.244
- 20.165.94.46
- 52.123.252.212
- 135.233.45.223
- 72.154.7.114
- 52.110.12.50
- 52.110.12.55
More Brontok samples · Latest analyzed threats · ATT&CK coverage
Analyzed on MalwareAnalyzer by Cyble · Open interactive report