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

Static analysis result for SHA-256 20f13b617064d047…

MALICIOUS

Office (OOXML) / .DOC

16.2 KB Created: 2022-04-24 23:17:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-04-27
MD5: 8558ae2a042905610c24bf8a5c760f15 SHA-1: fd2501008325f673ba26ddb071eb61f4eac9ceda SHA-256: 20f13b617064d047dc28a43ad616bd146dcf2e0c8b390fd1dab8a42c292ea660
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File T1547.001 Registry Run Keys / Startup Folder

The sample contains a VBA macro that executes upon opening the document, as indicated by the Document_Open heuristic. The script reconstructs a URL 'http://ckrddvcviumq.ru/p73tzhj.xij' and uses PowerShell to download and save it as 'C:\Users\Public\serviceword.exe'. It then creates a shortcut in the user's profile pointing to this executable, and also attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 8

  • ClamAV: Doc.Malware.Valyria-10008068-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10008068-0
  • 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
  • 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
  • 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
50b928d59065f9beaceb329a9860178cb99d7445bfb8b2d5124ff2e762182b13		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1282 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
21b4f26a4c4a2a73917320efebeeb6b31dc7f67d7f1bdb50a949da1bcd6ca41b		 vba-project OOXML VBA project: word/vbaProject.bin 9216 bytes
Detection
ClamAV: Doc.Malware.Valyria-10008068-0
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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