MALICIOUS — b7c7fa72fec2e59ae7f643d42a1186fc095beb2daab4ec2abc9597702b8825c4
MALICIOUS — b7c7fa72fec2e59ae7f643d42a1186fc095beb2daab4ec2abc9597702b8825c4 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 6 ATT&CK techniques.
Identification
- SHA-256:
b7c7fa72fec2e59ae7f643d42a1186fc095beb2daab4ec2abc9597702b8825c4 - SHA-1:
23e68637d3614e4e24086917717895bbb0c52b07 - MD5:
c4eb358f26072ddb788f45bd2cf62be2 - imphash:
c81d603829cdee893f69bc47cb4f6e00 - ssdeep:
1536:5vvMoORizUPliPsm/gL16ZpQGh6MgHN+PhuLGR/11bvTRMoOJ:RvxOMUMPsgQvTMY+PhGGR/1179xOJ - TLSH:
T1D83A3A286075F706E7C6DC27A7358A4E90016478E2F46ECA21C2C24F71F1F639C865EA - Submitted as: b7c7fa72fec2e59ae7f643d42a1186fc095beb2daab4ec2abc9597702b8825c4
- File type: pe · Size: 99999 bytes
- Verdict: malicious (100/100) · Family: Brontok
Detections (6 of 55 engines)
- capa (capabilities): capability:credential-access
- ClamAV (daily): Win.Worm.Brontok-9815928-0
- YARA: JPCERT/CC: JPCERT_HUILoader_PlugX_SideLoad
- Microsoft Defender: Worm:Win32/Brontok.BJ@mm
- Emsisoft (Emergency Kit): Win32.Worm.Brontok.AM
- Kaspersky (KVRT): Email-Worm.Win32.Brontok.o
MITRE ATT&CK
Why this verdict
The malicious score of 100/100 is the fusion of 11 weighted signals:
- ClamAV (daily) flagged Win.Worm.Brontok-9815928-0 (rule
Win.Worm.Brontok-9815928-0) - engine signal, weight 0.90, confidence 0.95 - 2 behavioral detection(s): Registry Run Key Persistence [high] (rule
tl-run-key) - dynamic signal, weight 0.60, confidence 0.90 - access stored credentials (rule
access stored credentials) - capa signal, weight 0.50, confidence 0.80 - 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 23 external host(s) at runtime (21 HTTP) - network signal, weight 0.40, confidence 0.80
- Anti-analysis: T1497, T1497.001, T1082, T1622 - dynamic signal, weight 0.40, confidence 0.75
- YARA: JPCERT/CC flagged JPCERT_HUILoader_PlugX_SideLoad (rule
JPCERT_HUILoader_PlugX_SideLoad) - engine signal, weight 0.35, confidence 0.70 - persist via registry run key (rule
persist via registry run key) - capa signal, weight 0.35, confidence 0.60 - communicate over HTTP (rule
communicate over HTTP) - capa signal, weight 0.30, confidence 0.60 - Observed at runtime: Modify Registry (T1112) (rule
Modify Registry) - dynamic signal, weight 0.12, confidence 0.90
Dynamic analysis (windows)
28443 behavior events · 3 ATT&CK techniques · 0 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
- settings-win.data.microsoft.com
- config.edge.skype.com
- windows.msn.com
- oneocsp.microsoft.com
- www.msn.com
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/753bb2df-a166-494f-aa7d-5678b1ef0c56/pieceshash?cacheHostOrigin=dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice/files/753bb2df-a166-494f-aa7d-5678b1ef0c56?P1=1787807180&P2=404&P3=2&P4=AIKyC%2bL%2fY8qPRACeAOJCLaTNXvaV5Rhzd5WdDPUeEf%2b1til9q0gX0TDa7dn13NB93NNSInc6GCwE2ffgH3m36A%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice//files/c74a5353-3e6a-42b7-94d6-9b96c560c89a/pieceshash?cacheHostOrigin=dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice/files/c74a5353-3e6a-42b7-94d6-9b96c560c89a?P1=1787807254&P2=404&P3=2&P4=ZqMfhhu3oJY3D8la7666zr7XrFX%2fff3sMmijTJSC2U%2bZOGiH89f8cFFWBohPb7xgzDhAS%2fSJn4XXypywuUruhw%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
Embedded domains
- services.com
- yesbron.com
- 15-bali.com
- k.com
Embedded IP addresses
- 20.184.175.8
- 52.123.252.241
- 40.84.97.4
- 52.230.60.54
- 4.230.171.124
- 20.184.175.16
- 74.178.76.128
- 74.178.240.51
- 74.178.240.61
- 52.123.128.14
- 20.112.250.133
- 52.123.129.14
- 20.184.175.0
- 172.178.240.163
- 135.234.160.244
- 203.26.79.13
- 52.123.252.238
- 52.148.114.188
- 20.165.94.46
- 125.56.205.122
- 125.56.205.32
- 72.145.35.99
- 52.110.12.11
File paths
- C:\Baca
More Brontok samples · Latest analyzed threats · ATT&CK coverage
Analyzed on MalwareAnalyzer by Cyble · Open interactive report