AgentTesla — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 256e0c5f8ff44b8e…

MALICIOUS

Office (OOXML) / .DOC

15.9 KB Created: 2022-10-04 12:15:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-10-10
MD5: 5a8e9dab93423703f69196697335f39a SHA-1: f1e30928c544590b01f81c17aa5c7c326f66c57f SHA-256: 256e0c5f8ff44b8eeabd77e1a9244546b2cf52b9c04dce65c5c37ab4ed27e53a
284 Risk Score

Malware Insights

AgentTesla · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious OOXML document containing a VBA macro with a Document_Open auto-execution trigger. The macro uses the Shell() function to execute a PowerShell command. This command downloads a second-stage executable from 'http://bitbucket.org/ale6781/asdqwezx/downloads/044.exe' and saves it as 'fqwqr12412.exe', then executes it. ClamAV detections confirm this is AgentTesla.

Heuristics 8

  • 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
  • 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
  • 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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/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
df556cbbdfcf93a31a39a14ee8cee565db973a1e53b1a379effb4c2e16fb5766		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1210 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
vbaProject_00.bin
bd622102b5d4e9c87fac3537fc8f12ea9556b9cc87dad603e492bd2014ca22d0		 vba-project OOXML VBA project: word/vbaProject.bin 10240 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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