Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 18b43a9986f1fe67…

MALICIOUS

Office (OOXML) / .XLSM

416.3 KB Created: 2021-03-08 07:30:03 UTC Authoring application: Microsoft Excel 16.0300
MD5: 77601b4700484588b7e6c3f3137ac954 SHA-1: 7edfaec2067e01d37389adbfdedc92220f7861af SHA-256: 18b43a9986f1fe67431983a2a380639dab5c4942981519559f3eae73965b75c6
220 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an XLSM file containing a Workbook_Open macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary code. ClamAV detection explicitly names this as a Dridex downloader variant, strongly suggesting its family and purpose. The macro's obfuscated string concatenation likely forms a URL or command to fetch and run a secondary payload.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Downloader.DridexGreen09213-9890103-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.DridexGreen09213-9890103-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
5c86907c54ccc14415d91dc1c07ad6e5848a9d6d4a92b97aeec7987c66037713		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 38547 bytes
vbaProject_00.bin
53a6be9ae3683fa25bacb2f30edbbd1ef601b3a6a8d50a207bf2013ea3ab64e4		 vba-project OOXML VBA project: xl/vbaProject.bin 44032 bytes

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