Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 13252199b18d5257…

MALICIOUS

Office (OOXML) / .DOC

87.0 KB Created: 2024-08-09 12:14:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 810dcf6387c16acc4496d5c61b582681 SHA-1: 5b5555d3dc75411055465aecb4b007f9ce77c31b SHA-256: 13252199b18d5257a60f57de95d8c6be7d7973df7f957bca8c2f31e15fcc947b
330 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious Office document containing a VBA macro with a Document_Open auto-execution function. The macro uses CreateObject to instantiate a WScript.Shell object, which is then used to write to the registry key HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit. This indicates an attempt to establish persistence or modify system behavior, likely to download and execute a second-stage payload.

Heuristics 9

  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • ClamAV: Win.Phishing.VbsAgent-10036542-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Phishing.VbsAgent-10036542-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c96921f890c2511abe3f5d60f9a1bed6d1a78bc0ec992e831e4dba6f906801cc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6736 bytes
Detection
ClamAV: Win.Phishing.VbsAgent-10036542-0
Obfuscation or payload: unlikely
vbaProject_00.bin
ab7599be88a7f661e5ddb38b4a50afb2e760b7b24acfaf3b2f26514ed4acb6c9		 vba-project OOXML VBA project: word/vbaProject.bin 20992 bytes
Detection
ClamAV: Win.Phishing.VbsAgent-10036542-0
Obfuscation or payload: unlikely

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