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

Static analysis result for SHA-256 c221dc10d175c2f3…

MALICIOUS

Office (OOXML) / .DOCM

104.9 KB Created: 2020-12-24 08:21:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 549943fa268b65fee546e7adda0f06ba SHA-1: 0ffc18af6916d88bf456f32a2e85b85e56b6c109 SHA-256: c221dc10d175c2f3fb8366ad3aada1cf06c74ad8483a4a67bf62a0702b41c6f5
420 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The sample is a DOCM file containing VBA macros. Critical heuristics indicate the use of Shell() and WScript.Shell, suggesting the execution of arbitrary commands. The presence of a Document_Open macro further points to automatic execution upon opening. This indicates the macro is designed to download and execute a second-stage payload, consistent with a dropper functionality. The ClamAV detection of 'Doc.Dropper.Agent-6412232-1' reinforces this assessment.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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
  • 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/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
b35e2974059cfd698f78b5149865c966f76323ada3b5e6004618ea3cc95af631		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 135521 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 24 shell/COM execution token(s). Carved artifact contains 30 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
733759b60fc6d1d1c088318c031a62427d679f09a7cdcee9efec7ef52b34c195		 vba-project OOXML VBA project: word/vbaProject.bin 224256 bytes
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: likely
Carved artifact contains 24 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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