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

Static analysis result for SHA-256 d854e319c3789e71…

MALICIOUS

Office (OLE) / .XLS

254.0 KB Created: 2010-04-04 21:14:44 Authoring application: Microsoft Excel
MD5: 9404ac8dc5230e515be8b123fa3a4ae9 SHA-1: cd430207635964e2819ef1751d2053cf96d590be SHA-256: d854e319c3789e714cfff9fb4b9e34d987c4a24feae255bb354df8dbb846c1a4
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary commands upon opening the document. The ClamAV detection 'Doc.Dropper.HexEncodedEXEHeader-9789587-1' further supports its malicious nature as a dropper. The embedded document body text, while heavily obfuscated, contains strings that appear to be related to mathematical functions and potentially obfuscated code, but does not provide a clear lure. The primary function appears to be executing a secondary payload via the shell command.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open 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.
  • 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
419f515d01e5a3ad3330524bd71876bbd6dbb1f2c89e87aa5952679ac267bbac		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2889 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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