Office (OLE) malware analysis — malicious · 47f24b6dad45420a

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:47 Authoring application: Microsoft Excel

MD5: 81ed19c6162132320b85f9f0315df715 SHA-1: 565655e4ebe60f2351730056a122545ea096011a SHA-256: 47f24b6dad45420a7771eeed730e0c441335442b9dfb5983b80ed4871f37c013

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known method for executing malicious code. The `RUN=0` formula API suggests the macro is designed to execute a command or payload. The absence of document body text means the specific lure cannot be determined, but the macro execution is the primary threat.

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` `6ddb7b241ebdb7334727ba37a7fb8379816583ca62e55c32338020ea8be6249f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6742 bytes

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