Dridex Office (OOXML) / .XLSM malware analysis — malicious · 8bac502d02aebef5

MALICIOUS

Office (OOXML) / .XLSM

359.1 KB Created: 2021-03-03 17:25:23 UTC Authoring application: Microsoft Excel 15.0300

MD5: d3127b922e70794c42034aaf238cb358 SHA-1: 0ab11895b528eeabf2e544567f0f467d27b7a1fb SHA-256: 8bac502d02aebef57de2e4b324a71cb0d843c7cc1c66082ab37405e83afa6993

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

This XLSM file contains a Workbook_Open macro, a common technique for initiating malicious execution upon opening. ClamAV detections indicate it is a Dridex dropper, suggesting its primary purpose is to download and execute a secondary payload. The presence of VBA macros and the specific ClamAV signature strongly support this assessment.

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` `32a828f6d21d2429fcad5273f00bcf5751fa45e7b76b2c5dfcb4413f5680f03f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12594 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` `37421a73c23a5216bc49300f44f2026bda28021fb43a7f7a8b803dfd83ff4db8`	vba-project	OOXML VBA project: xl/vbaProject.bin	57856 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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