Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 44c5e56de3a11f30…

MALICIOUS

Office (OLE) / .XLS

144.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 7d260afcfd68f3310e1f6ccd863bb23d SHA-1: 68c59f187904213ec64fa8e26b878dc69beb991c SHA-256: 44c5e56de3a11f3084c300ef0f46b9a5d774c480cee43bedabe045c00fa3b680
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1036.005 Match Legally-Obfuscated String

The file contains VBA macros that execute upon opening, specifically a Workbook_Open subroutine. This subroutine utilizes Wscript.Shell to execute a batch file located at 'c:\programdata\jledshf.bat'. The batch file itself contains heavily obfuscated PowerShell commands, including base64 encoded strings, which are indicative of a downloader attempting to fetch and execute further stages. The presence of 'Wscript.Shell' and 'CreateObject' calls, along with the ClamAV detection for 'Doc.Downloader.EmotetExcel02226-9938630-0', strongly suggests Emotet activity.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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.

FilenameKindSourceSize
macros.bas
e5cfab216070fe1e4cc99c114be1118111da457aa00152d1441ffb86ba5a4299		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8906 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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