Office (OLE) / .XLS malware analysis — malicious · 2a1bb0006c158349

MALICIOUS

Office (OLE) / .XLS

196.0 KB Created: 2021-01-15 22:22:16 Authoring application: Microsoft Excel

MD5: 3b0d48b22075021e1c98dcb0a8768be1 SHA-1: bcd108e06c8411e8b407d5b0286724510cead96a SHA-256: 2a1bb0006c1583497ef27451158e471777c5035ce2099c70cb8a39a1936f6644

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 PowerShell T1204.002 Malicious File

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 macro designed to execute dangerous functions. The extracted macro script reveals an Auto_Open entry that constructs and executes a PowerShell command. This command downloads a file from 'http://tinyurl.com/4uq9tu7z' and saves it as 'ie.exe' in the user's AppData directory, then executes it. This indicates a downloader or dropper 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` `cac2bd85f26266f16f6f00a0e1adb64febf12b8fbca670c5ed30fc735d500ea4`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	1336 bytes

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