Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 8584034e9bd5505e…

MALICIOUS

Office (OLE) / .XLS

64.8 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: 5dbe39cef225c4c2109914428c61375f SHA-1: 32396e0ad9be8937a19e50a77b02c4d7d5b0884c SHA-256: 8584034e9bd5505e5b3c4025bd2e8a0cb665def2b86bdabbb4f3354f070f7d8b
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 name: 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 the 'cmd /c m^sh^t^a' obfuscation technique.

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.

FilenameKindSourceSize
xlm_macros.txt
0807f652a36752efcd354ce3c536f2fe7ed4cd53a3ff1787c33acb378dda90a0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1073 bytes

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