Emotet Office (OLE) / .XLSX malware analysis — malicious · 769fd464d1c1c4b3

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 8d9f116c599affac5d92aa0142894c89 SHA-1: a82e54ee379d2ff58c4ec63c6f6fd137e258a2c9 SHA-256: 769fd464d1c1c4b3fbb7664cbfd20ea31affd26c8d9b8cf87e0bbe7607cadddf

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is a malicious Excel document containing VBA macros. The Workbook_Open macro is triggered upon opening, which uses CreateObject to instantiate Wscript.Shell. This object is then used to execute commands that download and save two files, 'yhjlswle.vbs' and 'ughldskbhn.bat', to the 'c:\programdata' directory. The script also attempts to download payloads from a list of URLs, including 'http://santoftoritilla.com/_baks/tUX9/'. This behavior is characteristic of Emotet downloaders, which are used to deliver further malware.

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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