Dridex Office (OOXML) / .XLSX malware analysis — malicious · 21bf810cf015e8ff

MALICIOUS

Office (OOXML) / .XLSX

254.6 KB Created: 2021-03-08 16:24:50 UTC Authoring application: Microsoft Excel 15.0300

MD5: 389b02e6843fe288c18f784be63df9c1 SHA-1: 2d86d4f667515c092984fd02ce99d20aac3608c5 SHA-256: 21bf810cf015e8ffec9b844632a94274d9d387ad528e7d75adf116acea5a4d4b

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1566.002 Phishing: Spearphishing Attachment T1059.005 Command and Scripting Interpreter: Visual Basic T1105 Ingress Tool Transfer

The file is an OOXML Excel document containing a Workbook_Open VBA macro, a common technique for initial execution. ClamAV detections explicitly identify it as a Dridex dropper. The macro likely downloads and executes a second-stage payload, as indicated by the 'Doc.Dropper.Dridex-9845759-0' signature and the presence of extracted VBA artifacts.

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.

Filename	Kind	Source	Size
`macros.bas` `bed13e03aaf98a4a746032471d54731eed5ce7afcb5053f295e1904ecd725561`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	13134 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` `1d21d6c54fdc22d447d6508bfdbe1b4d92d66d2673a857b93cecc733bdd78c4f`	vba-project	OOXML VBA project: xl/vbaProject.bin	60928 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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