Dridex Office (OOXML) / .XLSX malware analysis — malicious · dce37dbf9884c851

MALICIOUS

Office (OOXML) / .XLSX

199.0 KB Created: 2021-03-10 12:57:23 UTC Authoring application: Microsoft Excel 15.0300

MD5: c242e62e5af9159f1d7c31fa37402553 SHA-1: 1f02c8d2f314985eb19fe6410ad2a39a4464d58a SHA-256: dce37dbf9884c851e6af5c61275d6ec7adbbbb191d7a4b90bcd5b5b2e1d32d0d

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment T1027 Obfuscated Files or Information

The file is an OOXML document containing VBA macros, specifically a Workbook_Open macro, which is a common delivery mechanism for malware. ClamAV detections strongly indicate the Dridex family. The Workbook_Open macro likely executes obfuscated VBA code to download and run 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` `bd76ae57d98e4c8fd47ba01aaffd064a3b9f4d60325103a1699cf30da5eec9d9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	16375 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` `0f62c72edda24fca4d7f4ca1f6a5eff57936b19fb92a6741acead827510db8f1`	vba-project	OOXML VBA project: xl/vbaProject.bin	68608 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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