Emotet Office (OOXML) / .XLSX malware analysis — malicious · ab26d5e342880ff9

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: a4ce294ba7f5a05142059207a2c047c4 SHA-1: 9639e4224c22e4840d93d5a016500d6c88b27d0d SHA-256: ab26d5e342880ff9ba9eef105435b001f150ffd553db93fe479b9e31a580aea4

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 ClamAV detection and the presence of a Workbook_Open macro strongly indicate Emotet. The macro uses CreateObject to execute a batch file and a VBScript, which in turn appear to download and execute further payloads from multiple URLs. The script also contains a long, obfuscated string that reconstructs to a series of URLs, likely for downloading the next stage. The reconstructed URL is "http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBSRH/,http://divachintextiles.com/wp-incluedes/WWHWRs8KvNzFm6/,http://hotelalandmalab.com/1520/bUdhEpdf/,http://shwenantawin.com/copma/XTnZJi02vfgV".

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` `5b7f262955e42a17302add9bbb43084e6c8340a6a3fb9297609bb0c333bd3093`	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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