Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 09fde9ea165ae44e…

MALICIOUS

Office (OLE)

147.0 KB Created: 2021-02-15 14:15:28 Authoring application: Microsoft Excel
MD5: 1fb20b7c567f6bb03e0b87e973083365 SHA-1: 6c3f0ba216cce623ac67f17145323a49cface237 SHA-256: 09fde9ea165ae44ebc4956fc4cdbc72c9f51db639219b7bef1975e0d571f8080
202 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open entry, which is designed to execute automatically upon opening. The macros invoke cmd.exe to run a PowerShell command that downloads and executes a second-stage payload from the URL http://45.153.203.54/Doc22A.j. This indicates a downloader or droppper functionality.

Heuristics 6

  • 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.
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://45.153.203.54/Doc22A.j

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
79f21d6ac5f136058781d2b5e772da6ceb355608c6118d935452a0c504dd2fd7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1182 bytes

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