MALICIOUS — virussign.com_f74f328ffa11d597d0c70a06d1e89cd0.vir

MALICIOUS — virussign.com_f74f328ffa11d597d0c70a06d1e89cd0.vir is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (99/100), attributed to the Expiro family. 5 of 56 detection engines flagged it, exhibiting 2 ATT&CK techniques.

Identification

• SHA-256: 6ad17e4a638ba2053d6ab27b15fa7e361404e79f8284a538b1631fb3441b20d4
• SHA-1: a1ec00894fdc9575e99736e5e3f0a8b5a5cb3757
• MD5: f74f328ffa11d597d0c70a06d1e89cd0
• imphash: 46c86421d03855f22048c22182f40032
• ssdeep: 3072:iYf6brnonpKBlojEGYx6KAMgl6VSkHteWpooCYt3pZz+nf6BdmbpR8CzLhf1D:qH2p/ElxgGDD7Ck++upxFtD
• TLSH: T1FC427CA4C02B3312E2F7C864747146EC8829B95C91B1AECE5303D17A45F6F7B84B68E5
• Submitted as: virussign.com_f74f328ffa11d597d0c70a06d1e89cd0.vir
• File type: pe · Size: 205222 bytes
• Verdict: malicious (99/100) · Family: Expiro

Source: VirusSign · first seen 2026-08-25T00:00:00.000Z · SHA-256 verified

Detections (5 of 56 engines)

• ClamAV (daily): Win.Ransomware.Expiro-9975896-0
• YARA: Yara-Rules community: YR_AntiDebug_Checks
• Microsoft Defender: Virus:Win64/Expiro.DE!MTB
• Emsisoft (Emergency Kit): Win64.Ransom.A
• Kaspersky (KVRT): HEUR:Trojan.Win64.AsowWiper.c

MITRE ATT&CK

• T1071.001
• T1057

Why this verdict

The malicious score of 99/100 is the fusion of 10 weighted signals:

• ClamAV (daily) flagged Win.Ransomware.Expiro-9975896-0 (rule Win.Ransomware.Expiro-9975896-0) - engine signal, weight 0.90, confidence 0.95
• Microsoft Defender flagged Virus:Win64/Expiro.DE!MTB (rule Virus:Win64/Expiro.DE!MTB) - engine signal, weight 0.55, confidence 0.85
• Emsisoft (Emergency Kit) flagged Win64.Ransom.A (rule Win64.Ransom.A) - engine signal, weight 0.55, confidence 0.85
• Kaspersky (KVRT) flagged HEUR:Trojan.Win64.AsowWiper.c (rule HEUR:Trojan.Win64.AsowWiper.c) - engine signal, weight 0.55, confidence 0.85
• Contacted 3 HTTP request(s) at runtime - network signal, weight 0.40, confidence 0.80
• YARA: Yara-Rules community flagged YR_AntiDebug_Checks (rule YR_AntiDebug_Checks) - engine signal, weight 0.35, confidence 0.70
• communicate over HTTP (rule communicate over HTTP) - capa signal, weight 0.30, confidence 0.60
• enumerate processes (rule enumerate processes) - capa signal, weight 0.20, confidence 0.60
• Extracted generic config (1 C2) (generic/advisory) - engine signal, weight 0.15, confidence 0.30
• Memory forensics: 4 finding(s) elsewhere in the guest, not attributed to this sample, e.g. RWX/private injected region in SppExtComObj.E (pid 5812) (rule windows.malfind.Malfind) - memory signal, weight 0.05, confidence 0.30

Dynamic analysis (windows)

26 behavior events · 0 ATT&CK techniques · 1 dropped files.

Runtime network

• www.msftconnecttest.com
• rb.symcd.com
• rb.symcb.com
• inference.location.live.net
• update.googleapis.com
• login.live.com
• desktop-hsgcbep
• v20.events.data.microsoft.com
• licensing.mp.microsoft.com
• config.edge.skype.com
• windows.msn.com
• www.msn.com
• officeclient.microsoft.com
• odc.officeapps.live.com
• assets.msn.com
• www.bing.com
• fe3cr.delivery.mp.microsoft.com
• th.bing.com
• settings-win.data.microsoft.com
• v10.events.data.microsoft.com

Dropped files

• f2953cec4c8c80f99e220f6a0f1eb5ec09b1c407b22b482768d04ba39f22f0b2 - f2953cec4c8c80f99e220f6a0f1eb5ec09b1c407b22b482768d04ba39f22f0b2

Embedded URLs

• http://www.microsoft.com/pki/certs/MicrosoftTimeStampPCA.crt0
• http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl0T
• http://www.msftconnecttest.com/connecttest.txt
• http://rb.symcd.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTDRSYViRCZTxmZjLENmnwVjLly9QQU1MAGIknrOUvdk%2BJcobhHdglyA1gCEF0QyxjrOnkAh4OrdHf50xk%3D
• http://rb.symcb.com/rb.crl

Embedded domains

• crl.microsoft.com
• www.microsoft.com

Embedded IP addresses

• 51.116.253.170
• 4.144.132.223
• 4.230.171.124
• 135.232.92.97
• 20.42.179.204
• 4.150.223.99
• 74.178.240.61
• 104.18.33.89
• 135.233.45.222
• 52.110.12.11
• 52.110.12.51

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report