Dridex Office (OOXML) / .XLSM malware analysis — malicious · 99bd5914039d8402

MALICIOUS

Office (OOXML) / .XLSM

240.6 KB Created: 2021-03-08 16:24:06 UTC Authoring application: Microsoft Excel 15.0300

MD5: c203a4725a47fe34b5811a122d45733e SHA-1: 6c39c1922d4f2c5b50d8431ec1b61e73b7d2731f SHA-256: 99bd5914039d840274690ce7223d6504d72724a3eb55dd4dfce6de855b989174

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

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

The file is an XLSM document containing a Workbook_Open macro, a common technique for initial execution. ClamAV detections identify it as a Dridex dropper. The presence of VBA macros and the specific ClamAV signature strongly indicate its malicious intent as a downloader for further stages of the Dridex malware.

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` `a7906bd3d22734b4b2402feb73879363a99eb3435e7477f44b6a3bf8c1c381ec`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	13616 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` `f2c2c155a74dec38b93e38a4db09c105740d113334ff430c997a562136a53baf`	vba-project	OOXML VBA project: xl/vbaProject.bin	63488 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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