Dridex Office (OOXML) / .XLSX malware analysis — malicious · 8277677a880ef41d

MALICIOUS

Office (OOXML) / .XLSX

426.4 KB Created: 2021-03-08 16:26:28 UTC Authoring application: Microsoft Excel 15.0300

MD5: 0fdd86256c9ad0807bd5ccc1d9ad0e3e SHA-1: 9607e06ccc3c146268f010f809640c50dba8fd25 SHA-256: 8277677a880ef41d6c36ff8f8f5250c616e418a9f6fbb9a4e5edd60c2eb8deac

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 presence of a Workbook_Open macro and VBA macros, combined with ClamAV detections of 'Doc.Dropper.Dridex-9845759-0', strongly indicates a Dridex dropper. The macro likely attempts to download and execute a secondary payload, a common tactic for this malware family. The GetObject call and Environ() function usage further support the analysis of macro-based execution.

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` `caa5fce94513a017156eebf9091c95a544abe19f052ce8e70f5f0eca4e337cbc`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	13486 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` `b67b74af654d60534ab4edb08a7016a51e2da48e3c734f770b70c931fbb1e0a6`	vba-project	OOXML VBA project: xl/vbaProject.bin	68096 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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