Dridex Office (OOXML) / .XLSM malware analysis — malicious · ff8dc7752cc4945f

MALICIOUS

Office (OOXML) / .XLSM

418.2 KB Created: 2021-02-24 13:30:57 UTC Authoring application: Microsoft Excel 15.0300

MD5: b02e76e383b37dc16283fc4e3689cc48 SHA-1: e33d41019a8c182836abfe641916d25a589e2fdb SHA-256: ff8dc7752cc4945fa9ffc3430c4ef4ee511106bad99d63e20a856e84091b358f

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV detections for 'Doc.Dropper.Dridex-9845759-0' strongly indicate the Dridex family. The presence of a Workbook_Open macro (OLE_VBA_WBOPEN) and GetObject call (OLE_VBA_GETOBJ) are common techniques for executing malicious VBA code. The extracted artifact is also flagged as suspicious, suggesting it's a downloader. The VBA macros likely attempt to download and execute a second-stage payload, consistent with Dridex's typical behavior.

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` `75505746adbe5feb0cda0e42ba33586b7d43e249a4f16d269cc3119fd1c60bf3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	13425 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` `a7a431c1b2897344c22b4f07e54e294637e2bceb49ac13e16333d77c8c12dcfd`	vba-project	OOXML VBA project: xl/vbaProject.bin	58880 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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