Emotet Office (OOXML) / .XLSX malware analysis — malicious · 8833a061fd7b0742

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 68d865ebd15ff57e99a7e0effe726832 SHA-1: f912195122666d478016021eb1154556c1e43aaf SHA-256: 8833a061fd7b0742fda367ee4ac01bce4a8815b7d17999afa702d2bc35da2698

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 file is identified as malicious by ClamAV and exhibits high-risk heuristics for VBA macros, including a Workbook_Open event and CreateObject calls. The DOC BODY reveals the execution of a batch script and a VBScript, with the VBScript containing a heavily obfuscated PowerShell command. This PowerShell command reconstructs to 'powershell -e YertyDSrfGfHFTGUfHdghDfHxdgW4ehfgh78dfHDRgdsFhdfghdFBGDFnnctfGuiyfiJUCFdHdrGdhf', which is highly indicative of downloading and executing a second-stage payload from one of the provided URLs. The presence of the Workbook_Open macro and the execution of external scripts strongly suggest a downloader or initial access mechanism, consistent with Emotet.

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` `08c7ba84cd4407693d6c1f66f54224ec7d01f8951bac31a647eb0de875aaa9d4`	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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