Emotet Office (OOXML) / .XLSX malware analysis — malicious · ace4e240f1ca6a68

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: fd112f6185564329255c02c85b846288 SHA-1: de55a0ee9652b7e1e4c3635d656404580b16ebfb SHA-256: ace4e240f1ca6a6864a2f3266c482f73df2832d05414664eed4afaf788167af6

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The sample is an Excel document containing a Workbook_Open macro that executes obfuscated commands. The macro utilizes CreateObject to run 'wscript.shell' and attempts to download and execute a second-stage payload from multiple URLs, including 'http://harperohousprodcuts.com/Merch2/ARSf1LIQauH1rDi/A'. The presence of a Workbook_Open macro and the download functionality are strong indicators of Emotet activity.

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` `c96e5a0af8d008fd160821644b2cac629b0dc5829621886bb66677270dda4cb1`	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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