AgentTesla — Office (OOXML) / .DOCM malware analysis

Static analysis result for SHA-256 73de80c3f4980c69…

MALICIOUS

Office (OOXML) / .DOCM

630.0 KB Created: 2022-07-18 22:26:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2022-07-19
MD5: c0e317095e3f44baeb6c6a5d671483e9 SHA-1: ab16464715a18f04ddca374ea67f704902dda40d SHA-256: 73de80c3f4980c69b63095cd351680d970496296561274a6b06b3661c942b3ff
372 Risk Score

Malware Insights

AgentTesla · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

The sample is a DOCM file containing VBA macros, including a Document_Open auto-execution macro. This macro utilizes Shell() and CreateObject() functions, indicating an attempt to execute arbitrary code. ClamAV detections identify the file as Win.Dropper.AgentTesla-9969002-0, strongly suggesting it's a dropper for the AgentTesla information-stealer.

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
be130b3d659dc6e71d92057e9cad8cbdcda989db67e652ab09430ab4f78233c8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 19704 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
vbaProject_00.bin
e290471a9e3de6b72e6d02bd548b06a34dfc8bf76a76a7c0f5c2ef4c78adaf24		 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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