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

Static analysis result for SHA-256 2479b72c7d9c1056…

MALICIOUS

Office (OOXML) / .DOCM

22.5 KB Created: 2022-02-25 08:26:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-03-06
MD5: 957e28fc709cb719c32d4f13d95923ba SHA-1: f6017d586ceef2b62c1b6fd8460b1fb3b7f09421 SHA-256: 2479b72c7d9c105681dae0681632b305da819e6cf15ed86862422ae32c5d939a
310 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a DOCM file containing VBA macros, indicated by multiple high-severity heuristic firings including OLE_VBA_AUTOOPEN and OLE_VBA_WBOPEN. The embedded VBA script utilizes Windows API calls such as VirtualAllocEx, WriteProcessMemory, and CreateRemoteThread, strongly suggesting it attempts to allocate memory, write malicious code into a process, and execute it. This is further supported by ClamAV detections of 'Doc.Macro.Injection-6355574-0'. The primary attack pattern is macro-based execution of a secondary payload.

Heuristics 9

  • ClamAV: Doc.Macro.Injection-6355574-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Injection-6355574-0
  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/wordml
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash
    • 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
7fa7470901d97c5c4e0f3f43f701a96d58c09c7d068a11fcd407ae139cd241f7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 7870 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
7b9be9a31b3d74097c978b2fb2cb001c785167ace80fbd63d2dfdc77692bf528		 vba-project OOXML VBA project: word/vbaProject.bin 22016 bytes
Detection
ClamAV: Doc.Macro.Injection-6355574-0
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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