Office (OLE) malware analysis — malicious · 96a56c53e9dc5d74

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:05 Authoring application: Microsoft Excel

MD5: f300286f867829959b46e06719b73cc5 SHA-1: 2d3c7219fd6d3285a7243ab415d7ee387f114510 SHA-256: 96a56c53e9dc5d74aafa53a9d20d84777e45b95f484b876a4c774b076ff400e7

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro sheet containing an Auto_Open defined name, which is a critical indicator of malicious intent. This configuration allows the macro to execute automatically upon opening the workbook. The presence of dangerous formula APIs in the Auto_Open macro suggests it is designed to run arbitrary commands, likely to download and execute a secondary payload. No specific family could be identified.

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` `cae25d86d2a0b7a669caffb4910bd53a6be23b57c6a5f01d8bfcbdc2cd412de3`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6643 bytes

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