MALICIOUS — virussign.com_858cb77bcc238ff983efe802258390b0.vir

MALICIOUS — virussign.com_858cb77bcc238ff983efe802258390b0.vir is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (97/100), attributed to the Pioneer family. 8 of 51 detection engines flagged it, exhibiting 2 ATT&CK techniques.

Identification

• SHA-256: 43dca9f3895d301f90ada27c2622b53884d6a72ca21b9880594c111be90fb6cb
• SHA-1: 94035a12d7e16090b046ca66cf6ee3ced53c6075
• MD5: 858cb77bcc238ff983efe802258390b0
• imphash: c3019422f1e3cb755291edeb04ac16b0
• ssdeep: 49152:iF7wUlPiRsx3yd2OluON4fA9uLLwL+fZx/X3yd2OluON4fA9uk3yd2OluON4fA9Z:iF8UlosdLwL+fZx/D
• TLSH: T10E5B2A476891D6BBDAB1822719204F8DA79444F2697FC80BF353850D1CC712F6AA837B
• Submitted as: virussign.com_858cb77bcc238ff983efe802258390b0.vir
• File type: pe · Size: 2288887 bytes
• Verdict: malicious (97/100) · Family: Pioneer

Source: VirusSign · first seen 2026-07-31T00:00:00.000Z · SHA-256 verified

Detections (8 of 51 engines)

• capa (capabilities): capability:execution/powershell
• ClamAV (daily): Win.Virus.Pioneer-9111434-0
• YARA: JPCERT/CC: JPCERT_HUILoader_PlugX_SideLoad
• YARA: Yara-Rules community: YR_AntiDebug_Checks
• LIEF (executable format parser): lief:invalid-authenticode
• Microsoft Defender: Virus:Win32/Floxif.H
• Emsisoft (Emergency Kit): Win32.Floxif.A
• Kaspersky (KVRT): Virus.Win32.Pioneer.cz

MITRE ATT&CK

• T1059.001
• T1056.001

Why this verdict

The malicious score of 97/100 is the fusion of 7 weighted signals:

• ClamAV (daily) flagged Win.Virus.Pioneer-9111434-0 (rule Win.Virus.Pioneer-9111434-0) - engine signal, weight 0.90, confidence 0.95
• execute via PowerShell (rule execute via PowerShell) - capa signal, weight 0.40, confidence 0.80
• capture keystrokes (rule capture keystrokes) - capa signal, weight 0.40, confidence 0.80
• YARA: JPCERT/CC flagged JPCERT_HUILoader_PlugX_SideLoad (rule JPCERT_HUILoader_PlugX_SideLoad) - engine signal, weight 0.35, confidence 0.70
• YARA: Yara-Rules community flagged YR_AntiDebug_Checks (rule YR_AntiDebug_Checks) - engine signal, weight 0.35, confidence 0.70
• LIEF (executable format parser) flagged lief:invalid-authenticode (rule lief:invalid-authenticode) - engine signal, weight 0.35, confidence 0.70
• Embedded network infrastructure: http://tempuri.org, http://webservices.groove.net/Groove/2.0/GFS/, http://www.groove.net/Groove/2.0/GFS#CreateSession - static signal, weight 0.35, confidence 0.60

Dynamic analysis

No runtime behaviour was captured for this sample, so the analysis above is static only. That is a limit of this run rather than evidence the sample does nothing.

Embedded URLs

• http://crl.verisign.com/tss-ca.crl0
• http://crl.microsoft.com/pki/crl/products/CodeSignPCA2.crl0O
• http://office.microsoft.com
• http://tempuri.org
• http://webservices.groove.net/Groove/2.0/GFS/
• http://www.groove.net/Groove/2.0/GFS#CreateSession
• http://www.groove.net/Groove/2.0/GFS#GetSessionInfo
• http://www.groove.net/Groove/2.0/GFS#GetDisplayInfo
• http://www.groove.net/Groove/2.0/GFS#AddSessionView
• http://www.groove.net/Groove/2.0/GFS#RemoveSessionView
• http://www.groove.net/Groove/2.0/GFS#GetMemberList
• http://www.groove.net/Groove/2.0/GFS#DownloadFiles
• http://www.groove.net/Groove/2.0/GFS#GetDownloadStatus
• http://www.groove.net/Groove/2.0/GFS#SetupMultipleComputers
• http://www.groove.net/Groove/2.0/GFS#EditAlertSettings
• http://www.groove.net/Groove/2.0/GFS#EditDownloadSettings
• http://www.groove.net/Groove/2.0/GFS#ShowProperties
• http://www.groove.net/Groove/2.0/GFS#ShowSyncStatus
• http://www.groove.net/Groove/2.0/GFS#AddChatEntry
• http://www.groove.net/Groove/2.0/GFS#ExecChatCommand
• http://www.groove.net/Groove/2.0/GFS#GetChatUpdate
• http://www.groove.net/Groove/2.0/GFS#RemoveChatView
• http://www.groove.net/Groove/2.0/GFS#DeleteSession
• http://www.groove.net/Groove/2.0/GFS#MsgrSignIn
• http://www.groove.net/Groove/2.0/GFS#MsgrSendInstantMessage

Embedded domains

• crl.verisign.com
• crl.microsoft.com
• www.microsoft.com
• office.microsoft.com
• tempuri.org
• webservices.groove.net
• www.groove.net
• groove.net

File paths

• d:\office\source\groove\include\GrooveATLObject.h
• d:\Office\Source\groove\bin\ReleaseSym\GrooveShellExtensions.pdb
• S:\:k:q:u:
• X:\:`:d:h:l:p:t:x:
• D:\:l:p:
• L:\:`:d:l:
• X:\:`:d:h:l:p:x:
• X:\:l:p:
• X:\:t:
• T:\:d:l:t:
• P:\:d:
• P:\:
• T:\:t:
• T:\:h:
• X:\:`:d:h:t:x:

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report