Dridex Office (OOXML) / .XLSM malware analysis — malicious · adbfe3ab87bdb320

MALICIOUS

Office (OOXML) / .XLSM

774.6 KB Created: 2021-02-22 12:11:57 UTC Authoring application: Microsoft Excel 15.0300

MD5: 8e8fb3afaa9fa771d795cba815f7f409 SHA-1: 74661c38f3b1a769862bd2e963b5806e71a50986 SHA-256: adbfe3ab87bdb320c3ef08a99550da2b188dfabe822b90519806e5f399732b69

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic 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 (OLE_VBA_WBOPEN) and GetObject call (OLE_VBA_GETOBJ) within the VBA project suggests the macro is designed to execute malicious code upon opening the document. This code likely downloads and executes a second-stage payload, consistent with a dropper's 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` `8ac7c4eb1e1e6b7ab762ccb61cf554c6ecea925c1e5cd2e243a55fb889bf5ff5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	13614 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` `d99b1183dcb4838c44b96a79f8771d6e4bfac0cd50380be8acfcabc677d9374e`	vba-project	OOXML VBA project: xl/vbaProject.bin	57856 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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