Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 34f722adbb0175e1…

MALICIOUS

Office (OLE) / .XLSX

76.4 KB Created: 2022-01-26 21:52:19 Authoring application: Microsoft Excel
MD5: 5a4cc1a4120f64d87cf0a19594688db2 SHA-1: f27591916717db798150a6e177d1cbe439bb30f6 SHA-256: 34f722adbb0175e1361a15b145ebcbdb10aae2226c018e951abd6dacc2eed903
322 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1218.004 Client Execution

The sample contains an Excel 4.0 macro sheet with an Auto_Open defined name, which is a critical indicator of malicious intent. The macro sheet includes dangerous formula APIs and references mshta.exe, indicating it's designed to execute external code. The embedded URLs suggest the macro attempts to download and execute a second-stage payload. ClamAV detection as 'Doc.Downloader.EmotetRed02220-9938633-0' further supports the Emotet family attribution.

Heuristics 8

  • 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: Doc.Downloader.EmotetRed02220-9938633-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938633-0
  • 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://91.240.118.168/zzx/ccv/fe.htmlB
    • http://91.240.118.168/zzx/ccv/fe.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
ae04d5c104f21141f430aad243ecbad709822bd8efcfd8c6a83945c0ae8dd42a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3673 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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