Emotet Office (OOXML) / .XLSX malware analysis — malicious · fbb0b086fab08e01

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 080a2f5db448c9056fbeec2feca3da72 SHA-1: 0326cd46df270063aea7d8fdab001ced89e764d2 SHA-256: fbb0b086fab08e0145fba571d844d02e303ef596cbc9774838bd469247b7f4ca

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is a macro-enabled Excel file detected as Emotet. The Workbook_Open macro executes a batch script, 'jledshf.bat', which in turn executes a VBScript, 'tghklsd.vbs'. The VBScript is heavily obfuscated but appears to download payloads from multiple URLs, including 'http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBSRH/'. The script also attempts to execute a PowerShell command with a Base64 encoded string, likely to download and execute a second-stage payload.

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` `f5075f34258f0bca6e5baf0fcf4106a006f6d94cd670159fc8a859c24f8ec6a7`	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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