Office (OLE) / .DOC malware analysis — malicious · e5b384fcdedc837e

MALICIOUS

Office (OLE) / .DOC

2.19 MB Created: 2025-07-17 22:50:00 Authoring application: Microsoft Office Word

MD5: 2b590cf1bdb3c71e0c076e32e97814a7 SHA-1: f7664903d0ee020065a79113d0e3d81a4f58b4f6 SHA-256: e5b384fcdedc837e8ecd1a06964e0c142ba2a7943eda20d6098ee618420dc230

500 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1055.012 Process Hollowing

The sample is a malicious OLE document containing a large VBA macro. Heuristics indicate the macro references CreateProcess, VirtualAlloc, WriteProcessMemory, LoadLibrary, and GetProcAddress APIs, suggesting process manipulation and execution of external code. Crucially, it also fires for PowerShell and cmd.exe references within the VBA, and ClamAV identifies it as 'Doc.Downloader.Pwshell-10001336-0'. This strongly suggests the VBA macro is designed to download and execute a second-stage payload using PowerShell.

Heuristics 13

Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY

Reference to WriteProcessMemory API
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Reference to PowerShell high SC_STR_POWERSHELL

Reference to PowerShell
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
cmd.exe reference in VBA high OLE_VBA_CMD

cmd.exe reference in VBA
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/drawingml/2006/main
- https://www.nirsoft.net/kernel_struct/vista/IMAGE_DOS_HEADER.html�
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680305(v=vs.85).aspx
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680313(v=vs.85).aspx
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms680339(v=vs.85).aspx
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms680336(v=vs.85).aspx
- https://www.nirsoft.net/kernel_struct/vista/IMAGE_SECTION_HEADER.html
- https://msdn.microsoft.com/fr-fr/library/windows/desktop/ms684873(v=vs.85).aspx
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms686331(v=vs.85).aspx
- https://www.nirsoft.net/kernel_struct/vista/FLOATING_SAVE_AREA.html
- https://msdn.microsoft.com/en-us/library/windows/desktop/ms679284(v=vs.85).aspx

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `318206da2ad520d98dfd5370b146d93c90e0949f196c37c0c65ea81dd2fec99c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	863195 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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