Office (OLE) malware analysis — malicious · a96826f340dfcf1d

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:57 Authoring application: Microsoft Excel

MD5: ccc39ea37bac7ba8e71b911102611315 SHA-1: 5dc18ee296a7e9e7f93f7ca72025c85d03728ec0 SHA-256: a96826f340dfcf1dceb4ee33915ce32f00a7372dffa457be35bbf1b1730edd5f

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open defined name and dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code upon opening the document. While no specific URLs or hashes were extracted, the presence of the Auto_Open function strongly implies a downloader or initial execution stage for a more complex attack.

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` `1cbca8794fe1c660d21ce5ef9e4ce34507d270b3284bb640c97ea9835b9ff29a`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6585 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.