Emotet Office (OOXML) / .XLSX malware analysis — malicious · 1b4527ab89abaea8

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 16c1bb6ba21b6a5292a5820e4cb81cc0 SHA-1: e6f0110df847db77d26f40f8630a77411f9df5b2 SHA-256: 1b4527ab89abaea884b0aace3afc2b9ca7ff607f5535fa36ec46c77f6bd93f4e

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetRed02221-9938910-0. The presence of a Workbook_Open macro and CreateObject calls indicates that the document is designed to execute malicious code upon opening. The VBA script within the document attempts to download and execute a second-stage payload from multiple URLs, including 'http://harperhouseproducts.com/Merchan2/ARSf1LIcOauh1rDiR/'. It also attempts to save files to 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat', suggesting a downloader or dropper functionality.

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` `2dc5eaf09952a693c42151669704f4df259ff3daa84f50f3199427ce3c414f12`	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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