Office (OLE) malware analysis — malicious · 696e8e1073511bbf

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:34:21 Authoring application: Microsoft Excel

MD5: f3a85350cfa7d90f5f284660987252b2 SHA-1: a7a3910cbb4058f7d885362b5e15bde5c717044e SHA-256: 696e8e1073511bbf14f750398d83dd7d9ba4b276cf327cc6dc5fe37b4c0dad29

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further suggests the macro is designed to execute arbitrary code. While no specific URLs or hashes were extracted, the Auto_Open macro is the primary indicator of malicious intent, likely serving as a loader for a secondary payload.

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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `f6a0f800c5a52b7ee606da16b2b9c2e0fce1fa2867a959746deeb41d551abc45`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6424 bytes

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