Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 638afdc9d00c45cf…

MALICIOUS

Office (OLE)

1.27 MB Created: 2000-01-17 18:38:00 Authoring application: Microsoft Word 8.0
MD5: 911f5994c2c52fc0c05cfe1a2b7a2d56 SHA-1: 89fa5cbd0486d7b4cb1f8518f31a54b35e27577f SHA-256: 638afdc9d00c45cf05077f0922a23fd8c8a48b45dfbc23254ba5afd15f9061a9
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1105 Ingress Tool Transfer

The sample is a Microsoft Word document containing VBA macros. The macro code includes a call to the Shell() function, indicating it can execute external commands. The script attempts to write a file named 'c:\netldx.vxd' containing FTP credentials and a target IP address (209.201.88.110) to the local system, likely to facilitate the download of a second-stage payload. The presence of the 'Doc.Trojan.Marker' ClamAV detection further supports its malicious nature.

Heuristics 4

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Trojan.Marker-31 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Marker-31
  • 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.
  • 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
940d025a86dcc1e65907e77c7164a98efa383cab1b985dcb5c2a816bdc76b014		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22398 bytes
Detection
ClamAV: Doc.Trojan.Marker-1
Obfuscation or payload: unlikely

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