Emotet Office (OOXML) / .XLSX malware analysis — malicious · afbb8d64c9e7fca8

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: bffb405cc8032a7e4e97c15a4d0c4902 SHA-1: 91219669794993bf2cda3af7b19ca03adc440706 SHA-256: afbb8d64c9e7fca8da26e3c6910d4c4a894acf651b426e4cc75f68aaeeb1ecd2

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', strongly suggesting the Emotet family. The presence of a Workbook_Open macro and CreateObject calls indicates that the VBA code is designed to execute automatically upon opening the document. The script attempts to create and execute batch and VBScript files, and the reconstructed URL 'http://sumedahonline.com/wp-content/HyzNXJ300XQVBSRH/' is likely used to download a second-stage payload. The obfuscated PowerShell command within the script further supports the download and execution of malicious content.

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` `5ded7ece7b491109b908031341a81aa0bb2f44c738862d351d8a7c8e847ecc8d`	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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