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

Static analysis result for SHA-256 dd221c0b7c005797…

MALICIOUS

Office (OLE) / .XLS

64.4 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: 0c5192135381fdb4e799825c901be643 SHA-1: 1df5f2dccc17a815168e781ffcb49f7ad528a39b SHA-256: dd221c0b7c00579705ae33a75edd3e7563f436da1aff4d6f3f019a0dfdccde2b
100 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that executes a command to download a file from 'http://87.251.86.178/pp/cc.html' using 'mshta'. The document body explicitly instructs the user to 'Enable Editing' and 'Enable Content' to view the content, which is a common lure for macro-based malware.

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
1b5d2c0fd960b0ccb52c9814b8358c9c313741806cb2c5ef8340a3322e5a67a4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1391 bytes

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