Emotet Office (OOXML) / .XLSX malware analysis — malicious · c29fe439556b3a74

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 1fe9f18f2e990e86147707c39359fb20 SHA-1: a551f0cf4f90c659dd55470938f4cec3d72e5a13 SHA-256: c29fe439556b3a749d953a7c2dc804d821e253d58e282be0e92dcc630e9683f5

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample was detected by ClamAV as 'Xls.Downloader.EmotetExcel02223-9938902-0', strongly indicating the Emotet family. The presence of a Workbook_Open macro and CreateObject calls, combined with the embedded VBA script, points to a downloader. The script constructs a PowerShell command that attempts to download payloads from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBS RH/', and saves them to 'c:\programdata\jledshf.bat' and 'c:\programdata\tghklsd.vbs' for execution. This behavior is consistent with Emotet's typical infection chain.

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` `c882f2fa0b6b407ccc37d50d14efd6e7ba7fb810ac1080730633c985d9777ccc`	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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