Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 26ebcaa61a4db202…

MALICIOUS

Office (OLE)

162.5 KB Created: 2020-05-14 14:15:30 Authoring application: Microsoft Excel
MD5: 9e7fb06ec21d4e88980ce5f0f8348b31 SHA-1: f43eb776a1a5df72c92317790deaa7b074c6b361 SHA-256: 26ebcaa61a4db202eeb7b57d326a9468c5c763cb1f87504a29aa6cb472aa2f43
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

This Excel 4.0 macro-enabled document contains an Auto_Open macro, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN (ID 39) and the ClamAV detection signature 'Xls.Dropper.Agent-7850959-0' strongly suggest that this file is a dropper. The macro likely executes code to download and run a secondary payload, a common technique for initial access.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • ClamAV: Xls.Dropper.Agent-7850959-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7850959-0
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f4c6ca5ea6fa1f2c4301972c5a0d75a19a3a66692e1899f6021e67875144d1b1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 130086 bytes

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