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

Static analysis result for SHA-256 64f1802be306b2b6…

MALICIOUS

Office (OLE) / .XLS

43.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 204424487731693cb8738619b282f0d3 SHA-1: 42f7502de013c4aca9e286bef50830378214ed57 SHA-256: 64f1802be306b2b683f612b5f81593bb1fce9f97e28d6c9992ab1816a23e76d8
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

This Excel 4.0 macro-enabled workbook contains an Auto_Open macro that attempts to download a payload from 'http://mcs.ihdf.org/bxdskxok/'. The macro uses the `REGISTER` and `EXEC` functions to call `rundll32.exe` with `DllRegisterServer`, likely to execute the downloaded file. The document body also contains text that appears to be part of the download URL and the target DLL path.

Heuristics 5

  • 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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b68def77bf3d78b7c0be9f30ad60574365101f4a762f9255957bf746dbc07ff7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1729 bytes

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