Emotet Office (OOXML) / .XLSX malware analysis — malicious · aaf2e42ec40b10b9

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: cbb786c0c086bb851d6dda3d1b489a02 SHA-1: 1e193972f3a477d4ef6d5852823e1a74aa77a1a0 SHA-256: aaf2e42ec40b10b9598b727e274469008a9f749e59263cf04aa200ae5141004f

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is detected as Emotet by ClamAV and contains a Workbook_Open macro, indicating it's designed to execute malicious code upon opening. The embedded VBA script uses obfuscated PowerShell commands to construct and execute a batch file located at 'c:\programdata\jledshf.bat' and a VBScript at 'c:\programdata\tghklsd.vbs'. The PowerShell command also attempts to download a payload from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBSbRH/'.

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` `f7fcbe1ca6ee9987502f0ab234dd6fdeff38260eb266f018a01b992e2687998d`	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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