Emotet Office (OOXML) / .XLSX malware analysis — malicious · 40805a614d776744

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 579111cf352fa89b3e57ad34ab8f4eeb SHA-1: d30f39dc612e8f44e03f721476b52c52a7044a8d SHA-256: 40805a614d7767444aaf1f55db3e43d4ccda20096fb5ee84cf0dfa53bc777b2b

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell 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 indicates an attempt to automatically execute code upon opening the document. The macro uses CreateObject to instantiate Wscript.Shell, which is then used to execute a downloaded VBScript payload from a series of hardcoded URLs. The script also attempts to create a batch file and a VBScript file in the C:\ProgramData directory, likely for execution or persistence.

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` `dab5aee645c98a63eb6a9165c0586dc28a7b249570818c3f55fe40671d7e44d8`	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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