MALICIOUS — virussign.com_b58dc1afb42d592675b430619a4e8e40.vir
MALICIOUS — virussign.com_b58dc1afb42d592675b430619a4e8e40.vir is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (79/100), attributed to the Copak family. 4 of 55 detection engines flagged it, exhibiting 1 ATT&CK technique.
Identification
- SHA-256:
ba0eb0a050dcee7ee1cda2d19cf67b554a61dd15f987c5934aa3e17fe37e4320 - SHA-1:
f8c6b984982553e34ac9005832469b27a7d927ca - MD5:
b58dc1afb42d592675b430619a4e8e40 - imphash:
6ed4f5f04d62b18d96b26d6db7c18840 - ssdeep:
1536:oJMgGDCeGoumv7EqQjipdEkRkt7A3KrqKjhaYPQBY:oJMgGDCru7EqQepDy6KZd - TLSH:
T10F35022B05C9868ECA78B61C54FD9D9FE45DB2373F2E97C90800838685E82179CF566C - Submitted as: virussign.com_b58dc1afb42d592675b430619a4e8e40.vir
- File type: pe · Size: 58112 bytes
- Verdict: malicious (79/100) · Family: Copak
Source: VirusSign · first seen 2026-08-21T00:00:00.000Z · SHA-256 verified
Detections (4 of 55 engines)
- MalwareAnalyser heuristics (entropy/packer): high-entropy-sections:.bss
- Microsoft Defender: Trojan:Win32/Copak.GPAD!MTB
- Emsisoft (Emergency Kit): Gen:Variant.Cerbu.246963
- Kaspersky (KVRT): HEUR:Trojan.Win32.Copak.vho
MITRE ATT&CK
Why this verdict
The malicious score of 79/100 is the fusion of 4 weighted signals:
- Memory forensics: 4 finding(s), e.g. process hollowing in tsk_0bc31fe866 (pid 8280) (rule
windows.hollowprocesses.HollowProcesses) - memory signal, weight 0.70, confidence 0.85 - Contacted 31 external host(s) at runtime (22 HTTP) - network signal, weight 0.40, confidence 0.80
- Packing/obfuscation: high-entropy-sections:.bss - static signal, weight 0.25, confidence 0.55
- Dropped 1 executable file(s) at runtime - dynamic signal, weight 0.20, confidence 0.60
Dynamic analysis (windows)
106 behavior events · 0 ATT&CK techniques · 6 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
- licensing.mp.microsoft.com
- windows.msn.com
- oneocsp.microsoft.com
- www.msn.com
Dropped files
- C:\Users\analyst\AppData\Local\Temp\tsk_0bc31fe866654124.exe -
cf7f6c220341164dd84299001274a65feee208ce7c594f421fb5132614d34ca7 - ad9249094f51832d0e14e56970b6eb8eb7792307e0f5c8a1ffa05ee81197ba64 -
ad9249094f51832d0e14e56970b6eb8eb7792307e0f5c8a1ffa05ee81197ba64 - fde83fdcffe47888797c3405f3ce88edf527c5441c411669e54868d71fd84b60 -
fde83fdcffe47888797c3405f3ce88edf527c5441c411669e54868d71fd84b60 - 2c567d5f35e25e6fd48df3a51d4119e26c2c76558192b6e36683a91f0bccd5e2 -
2c567d5f35e25e6fd48df3a51d4119e26c2c76558192b6e36683a91f0bccd5e2 - 6577bced8e6b4a8c1b39f877a6ec08a1f4773a79ef02fbed78b32e00db406897 -
6577bced8e6b4a8c1b39f877a6ec08a1f4773a79ef02fbed78b32e00db406897 - d947a498b93d0091659f45c3a8973b3df4117cac28938590faa33f791bb6e1da -
d947a498b93d0091659f45c3a8973b3df4117cac28938590faa33f791bb6e1da
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=1787937052&P2=404&P3=2&P4=kwP40QY0dkRbKPiDzcGbzBnTNMsbwvH92l5ehyZBoDd0lwroVTYjwiKJ6H3azZyPQsFu1lpZvrPRsguvD5snoQ%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice//files/9a8a705c-852d-4d18-b32a-ee1d872f4bd9/pieceshash?cacheHostOrigin=dl.delivery.mp.microsoft.com
- http://203.26.79.13/filestreamingservice/files/9a8a705c-852d-4d18-b32a-ee1d872f4bd9?P1=1787937121&P2=404&P3=2&P4=nKP11W4aJOIkIaRyLbVu2XU%2f2zfoC9aJ3iqmQXHd0m0z26byUS695gxQSx8tvaABED7kFkkP25w8Gx8vQf1vig%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=1787937165&P2=404&P3=2&P4=EptovPZS6h%2faoIkMYvVA7%2f6K4WWL86UG2F4NYeJJ7C3ceGOiQBNUNy9jgJQQsG5GYydJhG8dAQQ7aDZuOPS3EA%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
Embedded IP addresses
- 40.79.163.155
- 52.123.252.229
- 20.247.184.197
- 57.155.101.212
- 4.230.171.124
- 52.123.252.193
- 74.178.76.128
- 20.42.73.26
- 74.178.76.54
- 135.232.92.137
- 52.123.129.14
- 20.236.44.162
- 40.99.133.242
- 52.123.128.14
- 4.150.223.96
- 203.26.79.13
- 52.123.252.223
- 74.179.71.159
- 52.123.252.219
- 52.168.117.174
- 135.233.45.221
- 172.66.2.5
- 92.223.78.30
- 52.148.114.188
- 52.110.12.52
More Copak samples · Latest analyzed threats · ATT&CK coverage
Analyzed on MalwareAnalyzer by Cyble · Open interactive report