Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6d8eb3eea264e41b…

MALICIOUS

Office (OLE)

43.0 KB Created: 2003-01-16 10:31:00 Authoring application: Microsoft Word 8.0
MD5: b5a5505114dbb0a2352ab7516897d356 SHA-1: ae625db0ac3034170c8727374d662c608b88cd2d SHA-256: 6d8eb3eea264e41b23db6d718fd001f7e079123dbe428b205809f66d6722a561
280 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The AutoOpen macro is designed to execute automatically, and it uses the Shell() function to download and save a payload to 'c:\netldx.vxd' from the IP address 209.201.88.110. The script also attempts to create a temporary file 'c:\hsf????.sys' to store log data. This indicates a downloader or droppper functionality.

Heuristics 6

  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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
eb42debd0a40e5eec91db0e519fa595519a4b7a235aada40e7bd5b4ba44c6d7a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 27091 bytes
Detection
ClamAV: Doc.Trojan.Marker-1
Obfuscation or payload: unlikely

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