Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 4227f9ac1776f391…

MALICIOUS

Office (OLE) / .DOC

240.0 KB Created: 2010-05-04 09:57:00 Authoring application: Microsoft Office Word
MD5: 21e9534c622b3921b009835bbaf9388f SHA-1: a765d01ab180c14a2d436d2721a021becde94aca SHA-256: 4227f9ac1776f3911c7e48140b694ee7b29d0c74881539f0ea82587b0f2b035e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is a malicious DOC document containing VBA macros, as indicated by the OLE_VBA_MACROS and OLE_VBA_DOCOPEN heuristics. ClamAV detections (Doc.Trojan.Xaler-1) on both the main file and an extracted artifact (macros.bas) confirm its malicious nature. The presence of VBA Chr string obfuscation in the extracted macro suggests it is likely a downloader for a second-stage payload. The document body text is in Kazakh and Russian and discusses economic indicators, which appears to be a lure.

Heuristics 5

  • ClamAV: Doc.Trojan.Xaler-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Xaler-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
  • 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.

FilenameKindSourceSize
macros.bas
843e5e51ac5233ec8ea9543cfff2e06e3f4ed9c32fc4f1d410ecfeb82da59b8e
vba-macro oletools.olevba.extract_macros (decoded VBA source) 242338 bytes
Detection
ClamAV: Doc.Trojan.Xaler-1
Obfuscation or payload: likely
Carved artifact contains 10 Chr/ChrW string-construction calls.