Emotet Office (OLE) / .XLSX malware analysis — malicious · 77873f8e80dbec75

MALICIOUS

Office (OLE) / .XLSX

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

MD5: c7c074b35decfc86297e144c7e4edb49 SHA-1: 12ec91459ad634658dd7ba5e86248fee817a9e99 SHA-256: 77873f8e80dbec75a711f104ef501aa63c3323f196986b170ff84ca398de0df7

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample is a macro-enabled Excel file identified as Emotet by ClamAV. The Workbook_Open macro executes a series of commands that appear to construct and execute a VBScript payload. The script is heavily obfuscated but reconstructs a list of URLs from which it downloads and executes further stages. Specifically, the script reconstructs the following URLs: 'http://santoertilala.com/_baks/tUX9/', 'http://donbaham.com/Home_files/YS0PAZPxYeeras/', 'http://barnhart-studies.com/eln-images/Vcbhg1nb/', 'http://blute.com/3Dtech/jLu8IAnnj3gK9WC/', 'http://zenzebra.net/plath/9Q0DBle/', 'http://realcourp.net/PhotoGallery/UwmRHceSGbaCeGF/', 'http://miniflam.com/eln-images/fSwbQjUMAfGxdw/', 'http://marezdecor.com/MarezGallery/SEQxWTpMJ7A8rAYt/'. It also writes a VBS file to 'c:\programdata\yhjlswle.vbs' and a batch file to 'c:\programdata\ughldskbhn.bat'.

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` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	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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