Emotet Office (OLE) / .XLSX malware analysis — malicious · 532accfd20c7aa39

MALICIOUS

Office (OLE) / .XLSX

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

MD5: cec15051c318b34306b62b65428588e4 SHA-1: 05a38bf5cee6589f640f525ec42ac88394581d7a SHA-256: 532accfd20c7aa39c2ca80f0a5e89cac858f086d9c3bbc3a7d8c87e27dfde273

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script uses CreateObject to interact with Wscript.Shell, and the DOC BODY reveals obfuscated commands that reconstruct and execute a batch file and a VBScript. The reconstructed command line for the batch file is: 'wscript.exe "c:\programdata\tghklsd.vbs"', and the VBScript itself is constructed from concatenated strings, ultimately downloading and executing payloads from multiple URLs. The ClamAV detection further confirms the malicious nature and points to the Emotet family.

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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