Dridex Office (OOXML) / .XLSM malware analysis — malicious · 95f756318785a87d

MALICIOUS

Office (OOXML) / .XLSM

172.0 KB Created: 2021-03-10 12:55:53 UTC Authoring application: Microsoft Excel 15.0300

MD5: 1d75119c55e364091caab74e2fc2c339 SHA-1: 0693bafddba835e3211e472ce8809f0a90d279bb SHA-256: 95f756318785a87df4e51c0ccf0cd5070fde36a50dc3a5c9eb65613ad142521a

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical ClamAV detections for 'Doc.Dropper.Dridex-9845759-0' strongly indicate the Dridex family. The presence of a Workbook_Open macro (OLE_VBA_WBOPEN) suggests that the VBA code automatically executes upon opening the document. This macro likely downloads and executes a second-stage payload, as is typical for Dridex droppers. The GetObject call (OLE_VBA_GETOBJ) is often used in conjunction with malicious payload execution.

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` `16ade8e6d30ce5d4bae159c5dc938ed1786c3aa1ee50d1eae4da5e407ea1c2ab`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	16204 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` `270c283de7a32a926b0589364fce3773bab4073b9ebbe7db28adec3abd86c333`	vba-project	OOXML VBA project: xl/vbaProject.bin	62464 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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