SUSPICIOUS — virussign.com_8b582f6f5a660c40930ea3903afd73a0.vir
SUSPICIOUS — virussign.com_8b582f6f5a660c40930ea3903afd73a0.vir is a pe sample analyzed by MalwareAnalyzer by Cyble with a suspicious verdict (48/100). 4 of 55 detection engines flagged it, exhibiting 1 ATT&CK technique.
Identification
- SHA-256:
637e3d699bc62ed5a6276596ff3fb58ae65382119c7d7a98263e74a3a4107ed4 - SHA-1:
f6485d7a44012535ed3247bf58a2fea35d9cbbcc - MD5:
8b582f6f5a660c40930ea3903afd73a0 - imphash:
6ed4f5f04d62b18d96b26d6db7c18840 - ssdeep:
1536:oxR8Aw+Wq1Vq7do9oGpyhaI4KFSCmBJwJrkWpptMH1jsSCAF:oxR8Aw/Do1pyWL7BSJ+lsg - TLSH:
T1B335029792D90CA1DE81B885D5089ACE4D8F71D6E97C2F03E50AECDF2D815AF47A0708 - Submitted as: virussign.com_8b582f6f5a660c40930ea3903afd73a0.vir
- File type: pe · Size: 58112 bytes
- Verdict: suspicious (48/100)
Source: VirusSign · first seen 2026-08-18T00:00:00.000Z · SHA-256 verified
Detections (4 of 55 engines)
- MalwareAnalyser heuristics (entropy/packer): high-entropy-sections:.bss
- Microsoft Defender: Trojan:Win32/Copak.GPAB!MTB
- Emsisoft (Emergency Kit): Gen:Variant.Cerbu.246963
- Kaspersky (KVRT): HEUR:Trojan.Win32.Copak.vho
MITRE ATT&CK
Why this verdict
The suspicious score of 48/100 is the fusion of 3 weighted signals:
- Contacted 23 external host(s) at runtime (20 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)
107 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
- windows.msn.com
- oneocsp.microsoft.com
- www.msn.com
- settings-win.data.microsoft.com
Dropped files
- C:\Users\analyst\AppData\Local\Temp\tsk_006ee69db79e4a37.exe -
7cf15ae71b4c095576fb314677a63fbf298a1e47ad06ebe2eeda6a384b8749fe - 242dc9d09195accdedfdbe490bb821bbc457f866a0b835c5208e96e659dcb3fa -
242dc9d09195accdedfdbe490bb821bbc457f866a0b835c5208e96e659dcb3fa - 2e37bb0fc1be59d963f808aa18f65b9ea564fdc8ef96572105d163051ef636ad -
2e37bb0fc1be59d963f808aa18f65b9ea564fdc8ef96572105d163051ef636ad - c018d6d74e06d5c692edbdae2acf2e53d6d86ec184d38f7ea96e869649061bce -
c018d6d74e06d5c692edbdae2acf2e53d6d86ec184d38f7ea96e869649061bce - 6577bced8e6b4a8c1b39f877a6ec08a1f4773a79ef02fbed78b32e00db406897 -
6577bced8e6b4a8c1b39f877a6ec08a1f4773a79ef02fbed78b32e00db406897 - 1efbbb408946896665b6ebddfb582f126f036b9b87cfea49ecc7a6af66348209 -
1efbbb408946896665b6ebddfb582f126f036b9b87cfea49ecc7a6af66348209
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=1787730603&P2=404&P3=2&P4=kbJb4Ac1X4OG8L39td5H1aRLy7CKwg114Av2Dok6yeywSaW3dtKMi%2fO8zi7mLlpkg5p4HKjdDLG60KEYyMqwHA%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=1787730696&P2=404&P3=2&P4=gYtmOtVWt5MO84sz1AswFJyAgAc%2bzeG2qJn0dpl2Jlwnw%2bZQ7h4%2f59SKJmczRaxS2lpd9jeHgMzbZsjXiT823A%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com
Embedded IP addresses
- 20.42.73.31
- 4.144.132.223
- 20.42.179.204
- 4.230.171.124
- 135.233.95.144
- 135.233.95.135
- 4.150.223.111
- 20.112.250.133
- 40.104.4.2
- 52.123.129.14
- 52.123.128.14
- 135.233.45.222
- 203.26.79.13
- 52.123.252.232
- 74.178.232.29
- 52.110.12.38
- 52.110.12.45
- 52.148.114.188
- 72.153.5.96
- 52.168.112.67
- 52.178.17.232
- 52.110.12.8
- 52.110.12.46
Latest analyzed threats · ATT&CK coverage
Analyzed on MalwareAnalyzer by Cyble · Open interactive report