Dridex Office (OOXML) / .XLSX malware analysis — malicious · bc6a029894712974

MALICIOUS

Office (OOXML) / .XLSX

207.5 KB Created: 2021-03-10 12:58:06 UTC Authoring application: Microsoft Excel 15.0300

MD5: f01bd4e45d3e569d12ec52b344194a1d SHA-1: 13c0a12b06327c9e9befee9b73963cc347422644 SHA-256: bc6a0298947129748c84a0ad5ea1406a826489729ac79ee5a89fd6176f3483c4

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The critical ClamAV detections for 'Doc.Dropper.Dridex-9845759-0' strongly indicate the Dridex family. The presence of a Workbook_Open macro and the GetObject call are common techniques for executing malicious VBA code. The extracted artifact also triggered ClamAV, suggesting it's a component of the Dridex malware. The VBA code likely downloads and executes 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` `ba3c948972161eb2bdb18bea1d0d0858ecde70b949d6656c6ddc706b2b89a967`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	17420 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` `910e9d8c3cc5bd0bb276c59b38f96d88603d5231aa54156e00e203573a279b99`	vba-project	OOXML VBA project: xl/vbaProject.bin	70656 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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