Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 81593db93c788dc8…

MALICIOUS

Office (OLE) / .XLS

142.5 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: 40839f8902e07e4e4ab600d54f913b1a SHA-1: 3050e70e96e13cc10553ad66ec0f4f7a0603acdf SHA-256: 81593db93c788dc8799f1fb638396aec67452b6d6d63e0a59cf8b95e5a75a610
300 Risk Score

Malware Insights

Emotet · confidence 95%

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

The critical heuristic 'OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER' and the presence of a Workbook_Open macro indicate an automated execution path. The VBA script contains obfuscated code that attempts to download and execute a payload from multiple URLs, including a reconstructed URL: http://rkeprua.com/inclube/FBXbsVAO1dU/f. This behavior is characteristic of Emotet downloaders, which are designed to fetch and run further malicious stages.

Heuristics 7

  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • 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.
  • 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
ffa342a8bb4eb541fe833e6254cf3f6e2f7d6f5436c011440a061030b6684f64		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6473 bytes

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