Emotet Office (OOXML) / .XLSX malware analysis — malicious · f2645a9a5ce8042e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 3234421c3a236d86b98948b258f05bb0 SHA-1: 7157c60c0280f9755549f4fa3b0117a4922bd815 SHA-256: f2645a9a5ce8042e3b5a95d29dc1810a7a4a7cf69f5d6f760219acee7b6fd27a

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetRed02221-9938910-0', indicating a known Emotet variant. The presence of a Workbook_Open macro and CreateObject calls strongly suggests an automated execution path. The macro's DOC BODY excerpt contains obfuscated commands that, when reconstructed, reveal the intent to download and execute a VBScript payload from multiple URLs, including 'http://haarephroductions.com/Merchandise/ARSf1LICoaHugRDiH/', and save it as 'c:\programdata\yhjlswle.vbs'. This is a common Emotet delivery technique.

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` `d41386837b1396f6d56e855d2e489b24b5949f736ff4fa03c61b24ec47149c23`	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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