Xls.Dropper.Agent-8884006-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 ae7bb2bd4d4aa1bc…

MALICIOUS

Office (OLE)

31.5 KB Created: 2020-07-14 21:55:05 Authoring application: Microsoft Excel
MD5: e9c4a609804f72a968477ee4ac18fd21 SHA-1: 8e963e79e30fa52dcf4425bc4e1928489b8d8380 SHA-256: ae7bb2bd4d4aa1bc6cbbb08b47597b3c555fc8391bfc96edce49448e0e31f67c
260 Risk Score

Malware Insights

Xls.Dropper.Agent-8884006-0 · confidence 95%

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

The sample is an Excel file containing VBA macros, specifically a Workbook_Open auto-execution routine. This routine utilizes a Shell() call, indicating an attempt to execute an external command or script. The presence of a long encoded blob and the ClamAV detection signature 'Xls.Dropper.Agent-8884006-0' strongly suggest this file acts as a dropper for further malicious activity.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Dropper.Agent-8884006-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8884006-0
  • 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
d1fd30dc94ded5d1eb125e85f8a3e851e5b8e322792828617547e79c3ccb2efe		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1777 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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