Emotet Office (OOXML) / .XLSX malware analysis — malicious · 2baec4177d340c77

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 2ece86a00aafa93fbc7cd8a7b8f248ec SHA-1: f53f122fe5983b20ce6c1681fc8e1630e857d633 SHA-256: 2baec4177d340c7799abdd49fa9294b66027f55cd7c0dac8c93a342d3abb21b4

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The file is detected as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0', indicating it is likely an Emotet downloader. The presence of a Workbook_Open macro and CreateObject calls further supports this. The DOC BODY contains obfuscated commands that appear to be PowerShell, attempting to download and execute files from multiple URLs. The script also reconstructs a long string which is likely a PowerShell command to download a payload from one of the provided URLs.

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` `5e8149a3f644d9c233c9a637edc6664d0ae4303f9da68a1bc9440c7f769221e9`	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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