Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e083ed5e484875d3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:19 Authoring application: Microsoft Excel
MD5: 443de6ebfa556a0011a389d87ed275a9 SHA-1: ea82620dfd647f7690485ec4082b3631868a48d2 SHA-256: e083ed5e484875d3b321161c82797fb8a17cb67a2c865ed3aa6cc648b5a6a898
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro-enabled workbook detected as malicious. It contains an Auto_Open defined name, which is a critical finding indicating that the macro will execute automatically upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands, likely to download and run a second-stage payload.

Heuristics 3

  • 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.
  • 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
54e6dd37a6aba17783a63c872de4f24b180a7f4b1adb4a17f6b5564c0a902d15		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6607 bytes

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