Emotet Office (OLE) / .XLSX malware analysis — malicious · 191b6aefd42595ff

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: f5a103375863be711a268e525ef467a8 SHA-1: a03fd98c7f91650f137eda9426cfeb1da06b1a81 SHA-256: 191b6aefd42595ffc19043927e5bbc8af54a3e4d4731243d648688ac02b9edfe

240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a strong indicator of malicious intent. The script attempts to download and execute a second-stage payload from multiple URLs, including 'http://midnighthilvercrafters.com/store/wBqNOUw/BI710N4cQ6R3/' and 'http://tempra.com/NAT_E_05_22_2009/BI710N4cQ6R3/', and saves it as 'c:\programdata\oue4hjld.vbs'. It also creates a batch file 'c:\programdata\bhnasleil.bat' which likely facilitates the execution of the downloaded payload. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' further supports the Emotet family attribution.

Heuristics 6

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

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `b83f40876e4de3ad43e2159dbd110002f22583e3211e64517a71e464021f1ae0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 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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