Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 998cb744d25c4505…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 8450a532feb986e55701fde5c5cd96d9 SHA-1: 0aa69d55dc255729933fe7f89be55b002e7f9f80 SHA-256: 998cb744d25c4505d1f1e986e97a21ca56409c6b970561d08df4a3df98f40500
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample contains VBA macros, specifically a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script attempts to download and execute a second-stage payload using VBScript and batch files. The reconstructed URL 'http://midnighitsilverbs.crafters.com/store/wBjNOUw/BI710N4cQ6R3/' and 'http://tempra.com/NAT_E_05_22_2009/BI710N4cQ6R3/' are indicative of Emotet's typical download infrastructure. The presence of 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat' further supports this.

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
e9c6d8e866d52f72d7dd6b6575202c3170988b4761f517cc2be75d886d8634fc		 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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