Emotet Office (OLE) / .XLSX malware analysis — malicious · 57a241a36b505433

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 4d5a188bd1b918f1619628a8dd7193c8 SHA-1: 12cacd3cb58a63cc76b546043e9fd4b1c47153b8 SHA-256: 57a241a36b505433e9b1ef73e3c2ba108761becc38a70b5c79cebf2a9e20916c

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.005 Visual Basic

The file contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The macro utilizes CreateObject to instantiate Wscript.Shell, enabling it to execute commands. The extracted document body contains obfuscated commands that reconstruct URLs and paths for malicious VBS and BAT files, such as 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat'. The script's intent is to download and execute a second-stage payload from the reconstructed URLs, consistent with Emotet's behavior.

Heuristics 7

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `de7bcbc45ff0a77d05d9af662bacc316e71be11a980e94f6673e556a5dd9d1bc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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