Emotet Office (OOXML) / .XLSX malware analysis — malicious · b3ec6d9296f75d15

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 444d5c490bf91be7c252f0b79ad5d6b0 SHA-1: 8bbbcde6245e5f0d214350de0ac965c270622429 SHA-256: b3ec6d9296f75d15a85b82a13630b9fa59ecad61eda85242325f25205e085683

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.EmotetExcel02223-9938902-0', indicating it's likely an Emotet variant. The presence of a Workbook_Open macro and CreateObject calls suggests an attempt to execute code upon opening. The embedded script attempts to download and execute a second-stage payload from multiple URLs, including reconstructed URLs like 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBRH/'. It also creates batch and VBScript files in the programdata directory.

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` `a43d23778d7549fb86e7da21035c92b398a7447e94b4040b72ff532afc4ab7dc`	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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