Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 38cef7c79589625d…

MALICIOUS

Office (OLE) / .XLS

134.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: e2b45d715ec12a0c30a88e71acf611e9 SHA-1: 5a2ab354c9c7453ffbfb6ed92a8d5a8050fe723e SHA-256: 38cef7c79589625d9510aabb060629b45ae6a7093ff732c6d2e8aa060f0fd414
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros that utilize `CreateObject` and `Wscript.Shell` to execute commands. The `Workbook_Open` event is triggered, which in turn calls a function that appears to download and execute a second-stage payload from a list of obfuscated URLs. The reconstructed URL from the obfuscated string is "http://mytelefoniestat.de/wp-content/bLM8fxV2MQ/lagnyapiental.com/wp-admin/OfXq/". This behavior is characteristic of Emotet downloaders.

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
d6216b1540c6d866e0cdc66ed3bfa2b79b477655c56d42a698e7b407351a97e3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6560 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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