Emotet Office (OOXML) / .XLSX malware analysis — malicious · 272aa8fd3f6ee18f

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: ca3f21b8d4782e90fe3e93bd5d2fb3be SHA-1: 14a4d8c35e4e26b3a59c80471fcd2fba3435becf SHA-256: 272aa8fd3f6ee18f56dc6197376bc312f0e25c8582bfb6fa2ebaa72db8145711

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 an Excel document containing a Workbook_Open macro, a common technique for initial execution. The macro utilizes CreateObject to execute a downloaded payload. The DOC BODY contains obfuscated commands that, when deobfuscated, reveal the intent to download and execute a VBScript and a batch file from multiple URLs. The reconstructed URL 'http://harperhouseproducts.com/Merchandise2/ARSf1LIcOauhH1rDrIH/' and the file paths 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat' are indicative of a downloader. The ClamAV signature also points to Emotet.

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` `f7b18335080beacdbaeb5ec9a7f7d95730839b4a9eafdf76811e6c325cded710`	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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