Dridex Office (OOXML) / .XLSM malware analysis — malicious · fc5a17121ad0516c

MALICIOUS

Office (OOXML) / .XLSM

302.6 KB Created: 2021-02-22 13:15:14 UTC Authoring application: Microsoft Excel 15.0300

MD5: 1300c689660c97228a19c55931d43ad7 SHA-1: 7296cb7264e090a464b0ba25a6cd7aefb116abe8 SHA-256: fc5a17121ad0516ced4bcc4e375f2052a3a542846469c824f17566f170e95e9a

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

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 executes automatically upon opening the document. The GetObject call (OLE_VBA_GETOBJ) is often used by malware to load and execute external components. The extracted artifact's ClamAV signature further corroborates the malware family and its dropper functionality. The VBA macros likely download and execute 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` `13b528aa0cc150d7d3fc5f403baa02e54407911e2df94246254748d15fd23dba`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12425 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` `0ff9587646c2c4ace1186f7fa1792ea82f3938b49c1d5ce5ba25889ba1d1fd8b`	vba-project	OOXML VBA project: xl/vbaProject.bin	53248 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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