Dridex — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 cbd94af79dbfdae6…

MALICIOUS

Office (OOXML) / .XLSX

197.1 KB Created: 2021-03-10 12:55:40 UTC Authoring application: Microsoft Excel 15.0300
MD5: eafbd081f0dcc40435cbf72c61d2f026 SHA-1: 2301fbe492155eb0477db35b814e61c1839e1725 SHA-256: cbd94af79dbfdae6456c49e2a74411ebb22523dc24028bd33044ab6e2adbf16a
268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment T1105 Ingress Tool Transfer

The critical ClamAV detections for 'Doc.Dropper.Dridex-9845759-0' strongly indicate the Dridex family. The presence of a Workbook_Open macro and GetObject calls within the VBA project suggests the macro is designed to execute automatically and likely download a secondary payload, aligning with Ingress Tool Transfer. The extracted artifact also triggered ClamAV, reinforcing the malicious nature.

Heuristics 7

  • 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)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f7f6d7d79b873a67fe7ca2eda29f4b9d332da257763b5a7f0ad0b3a8b8ea0db8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 18969 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
6431f5bfd6f0cbb69c66fea1eee471a2a04de0fe33c63f34a9f282c532a68f92		 vba-project OOXML VBA project: xl/vbaProject.bin 79360 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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