Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 50183427be6a6787…

MALICIOUS

Office (OLE) / .XLSX

121.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 5ba55f49b8bafc02f7a70fbbfd8cf13c SHA-1: b96130a59a20d7878d6767eb1f8c2f5de2bb9b9e SHA-256: 50183427be6a678778424206767f94fb8a807abe00bd630de081904c3851130c
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open, and CreateObject indicate a malicious macro-enabled document. The Workbook_Open macro executes a VBScript payload, which is reconstructed from the DOC BODY as 'http://youlanda.org/eln-images/n8DPZISf/,http://roseveideo.net/eln-images/EjdcCoMLY8Gy/,http://vbaint.com/eln-images/H2pPgtE8XzEN/,http://fragemakers.us/eln-images/U5W2IGE9m8i9hr/,http://niplaw.com/asoLidfoundatio,http://robereflow.com/cegi/3f/,http://vocoptions.net/cegi/ifM9R5ylbVpM8hfR/,http://mismicomputing.org/fonts/JO5/,http://roberflod.us/eln-images/DGI2YOkwS9XPOC/,http://mpmcomputing.com'. This script is likely responsible for downloading and executing a second-stage payload, consistent with Emotet's typical behavior.

Heuristics 7

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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
faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13985 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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