Dridex — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 bb7c1811d4376e65…

MALICIOUS

Office (OOXML) / .XLSM

190.3 KB Created: 2021-02-10 12:27:46 UTC Authoring application: Microsoft Excel 15.0300
MD5: b9fdfae0c5d4dbbc6a042f7d4c3efd79 SHA-1: d4466d48c5a1d147a9a2f0831139dffb3980dc90 SHA-256: bb7c1811d4376e657dfd7a1bdcf21c91066d18d4593ae1c51258a37b7b05b7cb
268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro, which is a common delivery mechanism for malware. ClamAV detections strongly indicate the Dridex family. The extracted artifact 'macros.bas' and the presence of VBA obfuscation suggest the script's intent is to download and execute a second-stage payload. The benign URLs present in the document do not appear to be malicious.

Heuristics 8

  • ClamAV: Doc.Dropper.Dridex-9845759-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Dridex-9845759-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8dde03a14986b720442a1df924aa72ab2d121a796c018be38b167b8624092b61		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13951 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 109 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
daa4ab4442348b53a3710005751b2629e7c1532ed2bdbf9597f87cea32d0c1b3		 vba-project OOXML VBA project: xl/vbaProject.bin 52224 bytes
Detection
ClamAV: Doc.Dropper.Dridex-9845759-0
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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