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

Static analysis result for SHA-256 4e66acbcffe7d70e…

MALICIOUS

Office (OOXML) / .DOCM

28.0 KB Created: 2016-08-25 09:11:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: fe5f055842579695f991830ecacd8dea SHA-1: 34360515774ee987097058296dfd4a2de86c658f SHA-256: 4e66acbcffe7d70e06e64ecd6b5aac762d78476093e3efe595573dac65fe06b8
362 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, including an AutoOpen macro that executes shell commands. ClamAV detections indicate it is a downloader, likely responsible for fetching and executing a secondary payload. The presence of the AutoOpen macro and the Shell() call strongly suggest a malicious intent to compromise the user's system.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Downloader.Donoff-10030344-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Donoff-10030344-0
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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.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/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
d60d6abf43792e39e59a09c8b947e01223f63d1f201bbabcfb7e003a20c9ec6b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13215 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
46350c29dda27c8b44baab74259f5c2634b6510c3a82601851bb7e41f9371067		 vba-project OOXML VBA project: word/vbaProject.bin 32256 bytes
Detection
ClamAV: Xls.Downloader.Donoff-10030344-0
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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