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

Static analysis result for SHA-256 ba087223efef70dc…

MALICIOUS

Office (OOXML) / .DOC

75.8 KB Created: 2021-03-16 04:39:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: a35cb4fd0acec4f032925172279ff06c SHA-1: 8a68c62420c6fa338abfcb66c2e9064a0035a43f SHA-256: ba087223efef70dc3f8d226ce94deb4e13addc6713f2f3304965b3a692b53960
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an OOXML document containing VBA macros, specifically an AutoOpen macro that utilizes Shell() and WScript.Shell to execute arbitrary commands. This indicates the document is designed to download and execute a second-stage payload. No specific family could be identified, but the technique is common for initial access.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.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
2a25fd468722c4f0c3eb7fe05bb287e99e1b0654a419005c8c82e742fac35107		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5157 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
0ef79d31d1b9a7c1b861b576210ca3fee598fb9ebb995b30405b1c7213c21964		 vba-project OOXML VBA project: word/vbaProject.bin 28160 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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