Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 8f00c0dc45b7b817…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: ec0618d99d2bbca91488feb336a2cfd3 SHA-1: 52e6727df64dff5e7a438cbba536351f85b6e886 SHA-256: 8f00c0dc45b7b8176bbe9708b29c5b82dd469b0483dff6fec7d1f46deac2ca5b
240 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 execution, and CreateObject calls strongly indicate malicious intent. The VBA script contains obfuscated commands that reconstruct URLs and filenames, including 'http://midnighsilverbcraft.com/store/wBjNOUwc/B110N4cA6R3/' and 'c:\programdata\oue4hjld.vbs'. The script's primary function appears to be downloading and executing a second-stage payload from these URLs, likely establishing persistence and further infection.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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
b66d9ec638490eb8ce6b9003882f8e4f915355bfb6edab3c423f20c7c192e5f3		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 52433 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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