Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 1482fc27b27835ce…

MALICIOUS

Office (OLE) / .XLS

142.5 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: 4a7a819d60c4443f79a629bd6380897d SHA-1: cc42793b5212d518b0271205204cb9c68493feb5 SHA-256: 1482fc27b27835cee458d808bbc39b569b18a3a27c4d112b508bf90650bff1f4
300 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV and exhibits critical heuristic firings for an obfuscated auto-exec VBA loader. The Workbook_Open macro is designed to execute obfuscated code that utilizes CreateObject to instantiate Wscript.Shell, which is then used to download and execute a second-stage payload from a list of URLs. The reconstructed URL is "http://rkeprua.com/include/FBXbVAAOd1DU/F,http://pozhadvokat.com/images/QmZXA9kRU8xBZG/ ,http://queens.renovaciog.lt/wp-includes/LHH/ ,http://renovamarketing.com/renovatio/Av/ ,http://remedy.eventmast.com/eapn/lpN6dcAppn/ ,http://keluargamalaysia.bliblah.com/cgi-bin/FUzc3KOKN3DNe/ ,http://pudbsma.insanrabany.sch.id/gkvb/sXVYo8HsPSFQh/ ,http://pinnaheadphones.net/870xg9/pN p3a1iHCKaZwYE V/,http://dandtremierhomes.com/eapn/lpN6dcAppn/,". The presence of Wscript.Shell and the download/execute pattern are characteristic of the Emotet family.

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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