Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 7c7164e2b432e5a1…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: ba0498e1ad231000260d4670dd8a63e7 SHA-1: d7e8f8bf0f83ff88a328658d2bd3acd95eff01e2 SHA-256: 7c7164e2b432e5a13c24126bf50edf8f0a922147927d35f7082afa8e2dd43a5e
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is identified as Emotet by ClamAV and exhibits high-confidence heuristics for VBA macros, including a Workbook_Open auto-execution routine and CreateObject calls. The embedded VBA script attempts to execute a batch file and a VBScript, and the DOC BODY contains obfuscated commands that appear to construct and execute PowerShell commands to download payloads from multiple URLs. The primary intent is to download and execute a second-stage payload.

Heuristics 5

  • ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12041 bytes
vbaProject_00.bin
fd1175829759079d5c1586f1328c015a1ae515379aa81fbed0ea91ecc8f2b0a1		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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