Office (OLE) malware analysis — malicious · da10ae7e82fdf991

MALICIOUS

Office (OLE)

57.5 KB Created: 2008-12-02 14:42:00 Authoring application: Microsoft Word 10.1

MD5: 1bb83c38dabd9c5aa169672dc86052df SHA-1: bc524da6deb507b44f806df71c6fa37968b9abb9 SHA-256: da10ae7e82fdf9911940b382d60ff11e751e7f94b34deaf86a1ae5faec166533

500 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains VBA macros, including AutoOpen and Auto_Close functions, which are commonly used to execute malicious code upon opening or closing a document. Critical heuristics indicate the use of WScript.Shell and Shell() calls, suggesting the script attempts to execute commands or download additional payloads. The presence of 'macros.bas' as an extracted artifact further supports this. The document body, a speech outline on organ donation, is likely a lure to encourage macro execution.

Heuristics 11

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
ClamAV: Doc.Trojan.ColdApe-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.ColdApe-2
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.
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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` `9524f6296ef6ec9dd3f9771751397371930f6ed32482ca9a5408a6ab7a7bd6c7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	6136 bytes
Detection ClamAV: Doc.Trojan.ColdApe-2 Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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