Office (OLE) / .XLS malware analysis — malicious · 8fe3e38513d90ab6

MALICIOUS

Office (OLE) / .XLS

70.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-26

MD5: 81673905e4c25d629256e07ba92db866 SHA-1: 79fa1aa8b888621e138c8b42a38e1c87b74744b4 SHA-256: 8fe3e38513d90ab6e8d2da6ccae7c02f77f01bc6e14f8ec34176dca83676108f

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 Auto_Open macro. This macro is designed to execute dangerous functions, including the RUN function, which is used to launch external programs. The extracted URLs are likely used to download and execute a second-stage payload. The macro's intent is to download and execute a payload from the provided URLs.

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` `5f20bdbf6f94896df27d741d7f763c34a2e9e08c568e4de1ac6b38332e22044d`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7624 bytes

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