Office (OLE) / .XLS malware analysis — malicious · c758f0b8db047bb9

MALICIOUS

Office (OLE) / .XLS

330.5 KB Created: 2020-06-22 06:07:04 Authoring application: Microsoft Excel

MD5: 8468aca7f5ec0fe12cc380edd34cad1b SHA-1: 9c4b8776330d83abc6c6a2b57250042760009082 SHA-256: c758f0b8db047bb911c4c20f97420fb722aa04fdd1934435ced80420cd093b0c

80 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.001 PowerShell

The critical heuristic firing indicates the presence of an Excel 4.0 Auto_Open macro, which is a known method for executing malicious code upon opening an Excel file. The macro sheet itself is very large and contains many obfuscated strings, suggesting it is designed to download and execute a secondary payload. No specific URLs or hashes were extracted, limiting direct IOCs.

Heuristics 2

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.
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` `8c26633ca44dc0ff235e2adf89d135bbbb5eafe196957a7b60c4cf5ff3c18b52`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	232094 bytes

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