Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 04008e0a3dbf1514…

MALICIOUS

Office (OLE)

43.5 KB Created: 2005-11-02 07:42:00 Authoring application: Microsoft Word 8.0
MD5: 7752f4cd5c0c041ec15e58f5e469b50e SHA-1: df4d08596b5d6c4c2cb054d52aa5585bfd7fa661 SHA-256: 04008e0a3dbf15145e4143a08145a809c61fc999bfeb8352600477c838e24f3d
460 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample contains VBA macros with critical firings for Shell() and WScript.Shell usage, indicating the execution of arbitrary code. The AutoOpen macro is present and attempts to execute code, likely to download and run a secondary payload. The ClamAV detections further confirm its malicious nature.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Win.Trojan.ColdApe-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.ColdApe-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.
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3fba35fc816ffd250e43032038269f8daec88784fe339f33a755c0bf15600a31		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 28910 bytes
Detection
ClamAV: Doc.Trojan.ColdApe-2
Obfuscation or payload: unlikely

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