Emotet Office (OOXML) / .XLSX malware analysis — malicious · 9a8de54932dca35e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: cfa0dce9539fdc8fdff222308b9409bd SHA-1: bb13e30eb0f622b5f6f7502bdd4c3d1e25799ae4 SHA-256: 9a8de54932dca35e14340ba28c9dfe4e0fff95ebd5a9ae7e43025db0c28fcdbf

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The critical ClamAV heuristic and high-severity OLE_VBA firings indicate this is a malicious Excel document. The Workbook_Open macro is designed to execute a batch file and a VBScript, which in turn attempts to download and execute a second-stage payload from multiple URLs. The reconstructed URL is "http://sumedahonline.com/wp-content/HyzNXJ30XQVBSRH/ or http://divachintexile.com/wp-includes/WWhWRs8KvNm6/ or http://hollandamabole.com/1520/bUdhpEPdf/ or http://shwenantawin.com/copma/XTnZJi02vfgV". This behavior is characteristic of the Emotet family, which often uses macro-enabled documents to deliver its initial payload.

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` `f8ac732979af11dad71dcd21899aecb9c212d78cd3bbb17c7f720a661ad15513`	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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