Office (OLE) / .XLSX malware analysis — malicious · ae0a700e0196cfa2

MALICIOUS

Office (OLE) / .XLSX

64.0 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel

MD5: 8354addeb717a763c318be1a9a32bd57 SHA-1: e8a8ebd4d59c6b25cf20edfe9fb844206252bce5 SHA-256: ae0a700e0196cfa2fb776f1aebe39f33dddec432a45f2a55640fd79082cb4106

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an Excel file containing an Excel 4.0 macro sheet with an Auto_Open entry. The macro attempts to download and execute a payload from the URL "http://87.251.86.178/pp/oo.html" or "http://87.251.86.178/pp/aa.html" using the command "cmd /c m^sh^t^a". The document body explicitly instructs the user to enable editing and content, a common lure for macro-enabled 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.

Filename	Kind	Source	Size
`xlm_macros.txt` `5b6a229f32f262b2c382f3c832a9f8a5e27f96ac7637e45dc67edc9bb251f152`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1514 bytes

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