Dridex Office (OOXML) / .XLSM malware analysis — malicious · 373f30874b0bf0ab

MALICIOUS

Office (OOXML) / .XLSM

242.6 KB Created: 2021-03-08 16:23:45 UTC Authoring application: Microsoft Excel 15.0300

MD5: 3f8ea86cf6cf87e687b31a59e087dd7f SHA-1: ef9e0e5ac5ede2626db2bc9c0683200fc8a4813a SHA-256: 373f30874b0bf0abdd58ab6b4fe7f1001c651dd1336649dff47b0d877a4afb5e

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

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 a Dridex family dropper. The presence of a Workbook_Open macro and the ClamAV detection indicate the likely intent is 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` `7eaa43cc344a279d59795220a100de95b55c4cd13025e4a42442fde4692ac6b8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	14951 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` `0e1e892a492b9e5454cd2ea486709dd521ee5b2723cd98e84352afa880e70b07`	vba-project	OOXML VBA project: xl/vbaProject.bin	66048 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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