Emotet Office (OOXML) / .XLSX malware analysis — malicious · e8fc8a3c7a1240ce

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 94359f2d688aec5a1dd683f4e04f2222 SHA-1: 2ceda9bb80d07a730aeca281c5363749509e64c5 SHA-256: e8fc8a3c7a1240ce210c3e443710d73400c76d8c51bb7c5b265a0fec812a44c2

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature Xls.Downloader.EmotetExcel02223-9938902-0, indicating a known Emotet variant. The presence of a Workbook_Open macro and CreateObject calls suggests an attempt to execute code upon opening. The obfuscated PowerShell command within the DOC BODY is reconstructed to reveal multiple URLs that likely serve as download locations for a second-stage payload. The script also attempts to create batch and VBScript files in the programdata directory.

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` `c64edc447747c4e8163ff7eba3dcb2449625da9d48d4ddb071a25ade481044ee`	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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