Emotet Office (OOXML) / .XLSX malware analysis — malicious · 41ac201e5ae4bd9f

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 53a36b82bb47da3c6716c464e702ba7e SHA-1: 38979e98ddd12e88ecf9974cb9a2612ba0545464 SHA-256: 41ac201e5ae4bd9f148312070969f9c9f9efe303372adffcc7693eae9daf03c2

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059.003 Windows Command Shell

The file is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetRed02221-9938910-0, indicating it belongs to the Emotet family. The presence of a Workbook_Open macro (OLE_VBA_WBOPEN) and a CreateObject call (OLE_VBA_CREATEOBJ) strongly suggests that the macro is designed to execute arbitrary code. The DOC BODY excerpt contains obfuscated commands that appear to construct and execute a VBScript payload from a series of concatenated strings, likely for downloading and running a second-stage payload from the provided URLs.

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` `634ddbe5cb609d7c5496169f47e4a7fba8c4bff838a4eacd4808bc2fe0a63246`	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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