Dridex Office (OOXML) / .XLSM malware analysis — malicious · 3d2935dd5d887bae

MALICIOUS

Office (OOXML) / .XLSM

412.5 KB Created: 2021-02-05 13:16:02 UTC Authoring application: Microsoft Excel 14.0300

MD5: 94a95320b8af43388bb6fa3cf847b748 SHA-1: c51156f8d40cbab2f6238e62f7d3dcad9db19467 SHA-256: 3d2935dd5d887baebbe3adb2168a07bdde5ace7fec3b9ce6b0f0bde6b3164d57

320 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro that utilizes WScript.Shell and CreateObject to execute arbitrary commands. This behavior is characteristic of a downloader, and ClamAV detection confirms it as a Dridex variant. The primary function is to download and execute a second-stage payload.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
ClamAV: Xls.Downloader.DridexGreen09213-9890103-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.DridexGreen09213-9890103-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `1b6f818251da6a492b45dbc0bd18057181a59457cdeb26135ad770527fe0d932`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2647 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `1c91e58b5968f575b083723e2f9dc6e5f2d7d44d00f0c984f76ff4c8e6ccc192`	vba-project	OOXML VBA project: xl/vbaProject.bin	19456 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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