Emotet Office (OOXML) / .XLSX malware analysis — malicious · c8d340c89b91fef6

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 96266e92f86958c8a8bbb058fdcfb585 SHA-1: b7af54c409a9902b72ba2ea1fd1b752351d446a3 SHA-256: c8d340c89b91fef6d39a15844aa354795ae580b38404fff1ece6ae81543a235d

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

This XLSX file contains a Workbook_Open macro that executes a series of obfuscated commands. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://harperhouseprodcuts.com/Merchandise2/ARSf1LICoauhH1rDiH/'. The ClamAV detection name 'Xls.Downloader.EmotetRed02221-9938910-0' strongly suggests the Emotet family. The obfuscated commands reconstruct to include 'wscript.shell -e' and a Base64 encoded string which decodes to a list of URLs and a path for a downloaded file.

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` `0624fdde58da931eca92e2f76c0bc37afcd46d9d845791a5b885bf3bd4c9f96b`	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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