Emotet Office (OLE) / .XLSX malware analysis — malicious · 40cae6f6c477ef28

MALICIOUS

Office (OLE) / .XLSX

47.3 KB Created: 2022-01-28 19:27:26 Authoring application: Microsoft Excel

MD5: 11179710f07f75e1401d4cb0042a4b4f SHA-1: ab780e5a8d7cc15bea93894bb8b94c62f333c1ea SHA-256: 40cae6f6c477ef286d9c0c425bd7278ff446703d5e95fd458427e93e097cea29

262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell

The file contains Excel 4.0 macros, specifically an Auto_Open entry, which is a known technique for initial execution. Heuristics indicate the use of mshta.exe with a command to download a payload from the embedded URL http://91.240.118.172/mm/nn/se.html. ClamAV detection further confirms this as an Emotet downloader variant.

Heuristics 7

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.
ClamAV: Xls.Downloader.Emotet-a5251d3d2d6d3722-9951020-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-a5251d3d2d6d3722-9951020-0
Reference to mshta.exe high SC_STR_MSHTA

Reference to mshta.exe
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://91.240.118.172/mm/nn/se.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `2a39d235e725445537a5ed24b54fc0fe8d7c72d89b68b4fdcce55aba466e47aa`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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