Dridex Office (OOXML) / .XLSM malware analysis — malicious · 7f322b2e240f3dfc

MALICIOUS

Office (OOXML) / .XLSM

187.2 KB Created: 2021-03-03 16:28:04 UTC Authoring application: Microsoft Excel 15.0300

MD5: 666f323aaaeb3ad7c537561f66d74132 SHA-1: 478f0bb55cef539818bffde3dc7f3175c29bf2cb SHA-256: 7f322b2e240f3dfc09f4be7d9cbc806feb902587fbba27520d4d8641c6fa683c

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic

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, 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` `cc17885c327e577fa483d38a4e5fb7fdaf4ff551710364569a30f24d19f2561d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12632 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` `766dbfe1b860e3e3e573f4f67524577eb2e2a9fc532ec06677b6b8bd35138e38`	vba-project	OOXML VBA project: xl/vbaProject.bin	61440 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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