Office (OLE) / .XLS malware analysis — malicious · 10d164258a05b430

MALICIOUS

Office (OLE) / .XLS

67.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-05-23

MD5: 26fe1a6dbcaedcd92be80daa3f91a595 SHA-1: f894d4913c99feb984e4885d46ef3935467b07b0 SHA-256: 10d164258a05b43017ea2344e234477490adaef157633778e0a2f2f558ef9385

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open entry, which is a critical finding. The macros are designed to concatenate strings to form URLs, such as 'http://vipteck.com/wp-admin/user/B8d6jr4pBND2HExAmI/lJWa95VlQ/', and likely execute a second-stage payload. This indicates a macro-based downloader attack pattern.

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

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