Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 9664740123170b91…

MALICIOUS

Office (OOXML) / .XLSM

420.1 KB Created: 2021-03-17 12:53:17 UTC Authoring application: Microsoft Excel 16.0300
MD5: f7f66672f19f2dabe4f7269e32eb8540 SHA-1: 688ba6fb074142755fecd74056278b145a282f5a SHA-256: 9664740123170b912430759af6cfad9ff784ccd266fe93909022093beff051c7
220 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates the macro is designed to execute arbitrary commands upon opening the document. The ClamAV detection name 'Xls.Downloader.DridexGreen09213-9890103-0' strongly suggests a Dridex downloader variant. The primary function of the VBA script is to download and execute a second-stage payload.

Heuristics 6

  • 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
  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3b99d97fe0817b58d679c2f2ccca068487aa77fe40ea3aa13c5a507425f7d87e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 39203 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
9d696c1ffafc5776961a0eb81677ed6abe807f6c921201b58a9ebd439d866b2a		 vba-project OOXML VBA project: xl/vbaProject.bin 71680 bytes

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