Office (OLE) / .XLS malware analysis — malicious · b32e8eae8c34562c

MALICIOUS

Office (OLE) / .XLS

86.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 58b167b13966790064ca3f0af410c677 SHA-1: e3278c90ff2e00fe042a2d95fffb204137b15640 SHA-256: b32e8eae8c34562c601d1744e97c758e371316554f451c4d5680beb0193b6d05

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an Excel 4.0 macro-enabled spreadsheet. It contains an Auto_Open macro that uses the RUN function, indicating it attempts to execute an external program. The DOC BODY and macro analysis reveal a lure to enable macros, disguised as a DocuSign document. The macro is designed to download and execute a second-stage payload from the URL 'http://xlslic02uiccnh03nruvp.com/index.' and attempts to run 'rundll'.

Heuristics 4

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.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
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` `a85eb4de9cfe3fe00bb6b820fec77c1720da7de1fe3c57572458c59bec552071`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2473 bytes

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