Emotet Office (OOXML) / .XLSX malware analysis — malicious · ad4a2949291b805d

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 37572cbc32e17da83f8d01b2a31d708e SHA-1: 6ea220c35b0d703e145d89500ae46cddf24ce1e4 SHA-256: ad4a2949291b805d12ec0688fa9c524eb9486ff610f9812b4ae39bedb47f63e5

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.001 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 it belongs to the Emotet family. A Workbook_Open macro is present, which is a common technique for initial execution. The macro likely uses CreateObject to execute a command that downloads and runs a second-stage payload from one of the reconstructed URLs, such as 'http://harperhouseproducts.com/Merchandise2/ARSf1LIcOauhH1rDrIH/'. The presence of both .vbs and .bat files in the ProgramData directory suggests the script is setting up persistence or further stages of infection.

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` `aa7ed8e97a96b079068aa6514a2f77d20f833e746624508dde219c9cf61c9598`	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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