Dridex Office (OOXML) / .XLSM malware analysis — malicious · 43923babb347034f

MALICIOUS

Office (OOXML) / .XLSM

392.6 KB Created: 2021-03-03 13:28:03 UTC Authoring application: Microsoft Excel 15.0300

MD5: facc5d850285178dd7eaafa36d632430 SHA-1: 40a412e3f4097d9b1a2b16b894edaf9110d75a07 SHA-256: 43923babb347034f92628a5b8792f07a9a710c3711d74a692ccb584944d249ca

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 VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. ClamAV detections identify it as 'Doc.Dropper.Dridex-9845759-0', strongly suggesting the Dridex family and a dropper functionality. The presence of VBA macros and the Workbook_Open heuristic indicate the macro is designed to run automatically upon opening the document, likely to download and execute a secondary payload.

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` `80be57912d422de7220058c758b14556536304bba04d02788bd7ab575b48d7b7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	14746 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` `faba06af9587d02780ee90e76c6fd6373db31f8cd8631aa9b21cf628f947bdb4`	vba-project	OOXML VBA project: xl/vbaProject.bin	67072 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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