Emotet Office (OOXML) / .XLSX malware analysis — malicious · c45225c25fa10f09

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 0393bf87020e55ddce9f32f8fb5fc818 SHA-1: 40bad9537dc544ba500fff5bf583327e4ef1616a SHA-256: c45225c25fa10f0973005c1ab6772643212780584f634f3d54ce4a03fa72ca71

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

This XLSX file contains a Workbook_Open macro that executes obfuscated PowerShell commands. The PowerShell script attempts to download and execute payloads from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBRH/', and also creates batch and VBScript files. The ClamAV detection and the nature of the script strongly indicate the Emotet family, known for its downloader capabilities.

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` `eb434eb8c2795de64ad519a08098fdb725bf4bd793f43e7f68936e6910c9319d`	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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