Emotet Office (OOXML) / .XLSX malware analysis — malicious · b0741db1f9e19cde

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 7140fd610d5ee0f137ba9f5e7a1cd7b4 SHA-1: deaf71069277d96d417ac5e7cf06bfebaaa41a78 SHA-256: b0741db1f9e19cdec14df1c0f40788ee1002d1cce303689ec9cbeb790e08c930

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 downloader. The Workbook_Open macro and CreateObject heuristic firings confirm the presence of auto-executing VBA code. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQEBSRH/BSRH', and writes a batch file to 'c:\programdata\jledshf.bat'. The extensive obfuscation within the script suggests an effort to evade detection.

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` `9b1fdba9cbeaf368670d7d6ef352e346f964909e7f3c423be52c9c3b15510973`	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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