Office (OLE) / .XLS malware analysis — malicious · b81dede24878d2f5

MALICIOUS

Office (OLE) / .XLS

67.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-20

MD5: 6546673cb8e35129a5fd132a1fd29201 SHA-1: 925eb992e9c227da0c39927b5c47d77ab6091fe2 SHA-256: b81dede24878d2f5b336b366da8dc830651982b1999409a0fbbcbf92ee95bcbd

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The critical OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics indicate the presence of an Excel 4.0 macro sheet with an Auto_Open function. This function is configured to execute dangerous API calls, specifically the RUN function, which is used to download and execute a payload from one of the provided URLs. The URLs themselves are listed in the DOC BODY section, suggesting a downloader or droppper functionality.

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` `67f6b164c4d6ea1ea8efe2ccdff056dde7fd1072da2bb20afe3b275864086c71`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7678 bytes

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