AgentTesla — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 95fd54c279464352…

MALICIOUS

Office (OOXML) / .DOC

388.9 KB Created: 2022-12-12 08:24:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2022-12-12
MD5: c4958d377a28aaccb8358833469d972c SHA-1: f4aa18d8dac35c27b44341c2e73bf68551bc5670 SHA-256: 95fd54c279464352c9dfcd4bb26af3377819bd622e9ebe88a693908586e84bd7
372 Risk Score

Malware Insights

AgentTesla · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample contains a VBA macro with a Document_Open auto-execution routine, which is a common technique for malware delivery. The macro utilizes Shell() and CreateObject() calls, indicative of executing external code. ClamAV detections confirm the presence of AgentTesla, a known information-stealing malware, and specifically flags it as a dropper. The primary function of the macro appears to be downloading and executing a second-stage payload.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Win.Dropper.AgentTesla-9969002-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.AgentTesla-9969002-0
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Suspicious extracted artifact info 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.
  • 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://www.allapi.net/
    • 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/2012/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
fa1b1874c847cf438a02cb636064ef0c5c577aac1f66982adf911e9689d8ac87		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 19700 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
vbaProject_00.bin
46f3778c67c1905c5a7d918adb9f2cf6c37471596b085404769469c29339c335		 vba-project OOXML VBA project: word/vbaProject.bin 49664 bytes
Detection
ClamAV: Win.Dropper.AgentTesla-9969002-0
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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