Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 98d537ff72c396e1…

MALICIOUS

Office (OOXML) / .XLSM

416.7 KB Created: 2020-05-27 18:47:49 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5e8f2b0d0890da4c7e7cdccd63e95894 SHA-1: 08dac09e3f80fa18753cb5cb04940fddd1bfdcec SHA-256: 98d537ff72c396e14be6da957765adafcc878bbb9cf9c06aae31495a05e584a8
260 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary commands upon opening the document. ClamAV detection identifies it as 'Xls.Downloader.DridexGreen09213-9890103-0', strongly suggesting a Dridex downloader variant. The macro's purpose is to download and execute a second-stage payload.

Heuristics 7

  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
e350cd8bed79e86daff4d1c51ca790cd35d3ad41c528d004088ea8b8883a6790		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6638 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
01a3df079c0d0df4714f0ac2d72715c3c98cb2dba85403f3615b34aca2ad417a		 vba-project OOXML VBA project: xl/vbaProject.bin 27136 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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