Emotet Office (OOXML) / .XLSX malware analysis — malicious · c5431cd5a5518772

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 8b8d7ddee478fbef10178a2eaad6e07a SHA-1: b851819a45a7ef0723d10492cbe7b2b21bb8ab60 SHA-256: c5431cd5a5518772b080636f3cc17f59b1ece1445239167c37243e64172cf1f2

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. The Workbook_Open macro is present, indicating automatic execution upon opening. The script reconstructs a complex string containing multiple URLs, which are likely used to download and execute a second-stage payload. Specifically, the script writes a batch file to 'c:\programdata\jledshf.bat' and a VBScript to 'c:\programdata\tghklsd.vbs', and then executes them. The reconstructed URL string is 'http://sumedahonline.com/wp-content/HyZNXJ30XQEVcBSRH/ ,http://divachintextiles.com/wp-inculdades/WHwWRKs8KvzNfM6/ ,http://hotelanamalabol.com/1520/bUdhEPdf/ ,http://shwenantawin.com/copma/XTnZJi02vfg'.

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` `1c533f6e743959dbab9e68b31294cb412a04d263fb94039b2c3bcae23c190bdf`	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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