Emotet Office (OLE) / .XLS malware analysis — malicious · 5e11a2a2bb81018c

MALICIOUS

Office (OLE) / .XLS

101.5 KB Created: 2022-04-01 07:14:19 Authoring application: Microsoft Excel First seen: 2022-04-05

MD5: c24f3e54782a3340cb2a5a6ca20aba79 SHA-1: 5aa1c53a04d915671c252901e4762b5a5822d407 SHA-256: 5e11a2a2bb81018c3e56456c361af6ae148bd6c2043349052ba5751898458938

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code. The macros are designed to download and execute a second-stage payload from one of the provided URLs. ClamAV detection further supports the malicious nature of the file, identifying it as an Emotet downloader.

Heuristics 4

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.
ClamAV: Xls.Downloader.Emotet-b2cbc93e36c0c13e-9950560-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-b2cbc93e36c0c13e-9950560-0
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` `8a188f103ec2ad9c430bbffc369798c3a872a3049e785c27c270542470084682`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7321 bytes

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