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

Static analysis result for SHA-256 a04e3b8df0378efb…

MALICIOUS

Office (OOXML) / .DOCX

23.9 KB Created: 2015-08-10 03:38:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: f38c13c32a66eb461bb2ed07b3a911b2 SHA-1: 563f872d2f7a9c8d1cedfccedf438deba1e5590a SHA-256: a04e3b8df0378efbddcdc643f144a4a3e2a8f634a2abeae2f64a398e3380eb00
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The file is an OOXML document containing VBA macros, specifically triggering AutoOpen and Shell() calls. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content', a common lure for macro-based malware. The critical heuristic 'OLE_VBA_DOWNLOAD' indicates the VBA code attempts to download a file from a URL. This suggests the primary function of this document is to act as a dropper for a second-stage payload.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Dropper.Agent-6879078-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6879078-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.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
f0507b8f6541bb670ceca40f205393ef091fe2cdb59b75b2dfcd02354c720e9a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5204 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
85067b39ee576ef2e219b440c52bbabfd2d9203c429ec513b4cdf206e248891d		 vba-project OOXML VBA project: word/vbaProject.bin 18432 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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