Emotet Office (OOXML) / .XLSX malware analysis — malicious · 3c7ce9185e4208cc

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: af6f72f7f6fe40c832a327ca7e3616a5 SHA-1: 6eec409653e155d256c7068361bc342c169f10d3 SHA-256: 3c7ce9185e4208cc8f35aa83111418772f8a0d30613e28f48c8f18ed9ddaee31

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 the signature 'Xls.Downloader.EmotetRed02221-9938910-0', indicating it's likely an Emotet downloader. The presence of a Workbook_Open macro and CreateObject calls strongly suggests malicious VBA code execution. The embedded document body contains obfuscated commands that appear to construct and execute a VBScript payload from a series of concatenated strings, ultimately downloading and running a second-stage payload from multiple URLs. The script also attempts to create a VBS file and a BAT file in c:\programdata\.

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` `26763af73b4af13ffbbd228e189d6075fc22d64bbdc2bcc254fbd5773e5253ca`	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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