Dridex Office (OOXML) / .XLSM malware analysis — malicious · 2355f05bca712ce3

MALICIOUS

Office (OOXML) / .XLSM

242.6 KB Created: 2021-03-08 16:23:18 UTC Authoring application: Microsoft Excel 15.0300

MD5: b46aa5f81d293bc7791a720b6447d01f SHA-1: a8ab19110c407b6e04e460fa8bc33685868a026d SHA-256: 2355f05bca712ce31b1fef911395862eb34e73db7a3ca0a6bee2664024e47518

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 delivery mechanism for malware. ClamAV detections identify it as Doc.Dropper.Dridex-9845759-0, strongly suggesting a Dridex family dropper. The macro likely downloads and executes a second-stage 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` `8f204ed424d03a570173b75463f0d05db7cd107cea3947a05d3b55f010590fc0`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	15089 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` `2ae2bd46dce86c24b9cc60d2103179c90c8ed64fb6a0132d4d17586b94481730`	vba-project	OOXML VBA project: xl/vbaProject.bin	65024 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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