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

Static analysis result for SHA-256 b357b3882cf8107b…

MALICIOUS

Office (OOXML) / .DOC

325.9 KB Created: 2020-04-13 18:42:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 126961b8c9a7a0e78899943f6c2a7ce9 SHA-1: 6c6419ee544e78448d0641f88ebd3ea2279f4f66 SHA-256: b357b3882cf8107b1cb59015c4be3e0b8b4de80fd7b80ce3cd05081cd3f6a8ff
260 Risk Score

Malware Insights

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

The file contains a VBA macro, specifically an AutoOpen macro, which is a common technique for executing malicious code upon opening the document. The heuristic firings and ClamAV detection indicate that this macro is designed to download and execute a second-stage payload. The extracted artifact is identified as Win.Dropper.Agent-10045433-0, suggesting a dropper functionality.

Heuristics 7

  • ClamAV: Win.Dropper.Agent-10045433-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Agent-10045433-0
  • 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
  • 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.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
392ab19643f06349329edb5e4188df2b88995d415fd0d97673971856a8d15dcb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 7971 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
ce5d4e47d1d3566eaf992cff1d1854b80852ac122a8972efb12fd9db034e6fc7		 vba-project OOXML VBA project: word/vbaProject.bin 684032 bytes
Detection
ClamAV: Win.Dropper.Agent-10045433-0
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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