Office (OLE) / .DOCX malware analysis — malicious · 2263f0dd7d4ba498

MALICIOUS

Office (OLE) / .DOCX

38.0 KB Created: 2005-05-18 16:35:00 Authoring application: Microsoft Word 8.0

MD5: e1531c9098a03a5b65731addd48143f4 SHA-1: aeac2d334086716da6a49548f0f7b3b1e819b1aa SHA-256: 2263f0dd7d4ba498b5911ce349fc6e86fdfbffa3321d0f81d99db3e4232d0219

400 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Document_Open macro, which is designed to execute automatically when the document is opened. The macro attempts to lower security settings and uses CreateObject to interact with other applications, likely to download and execute a second-stage payload. The ClamAV detection of 'Doc.Trojan.Darkstar-1' further supports its malicious nature. The macro manipulates registry keys related to Office security settings.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Doc.Trojan.Darkstar-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Darkstar-1
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.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `dd17b65bea197f01ac67a51575e6053af42bfc10841214d68ca86d3ecb7c5a1e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	3842 bytes
Detection ClamAV: Doc.Trojan.Darkstar-1 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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