AgentTesla — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 139feeab329f6a93…

MALICIOUS

Office (OOXML) / .DOC

15.9 KB Created: 2022-08-18 16:58:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-10-10
MD5: f8053bdd067fa884a0792eb138ca80a1 SHA-1: 438a66ab3e9472b7151b1d52888e3c0ad8360b2e SHA-256: 139feeab329f6a93b0f04711fff34a98ec769df323cefa4949fd28cf189b24cf
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 contains a VBA macro with a Document_Open auto-execution trigger. This macro decodes a hex string which, when reconstructed, reveals a PowerShell command. This command is designed to download a second-stage executable named 'OptionLocation.exe' from a Bitbucket URL and save it as 'fdsfsd41231.exe', then execute it. This behavior is consistent with AgentTesla, a known information-stealing malware.

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
debf31cb03822df333c38f1232daa1af1c9b8e6efaaa38923f474b0b7ee7362c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1244 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
vbaProject_00.bin
efeaef40b246fb2e160e5aa3fd4938390ba916ae4f81d59fcdd4e7fefec7b5b2		 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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