Dridex Office (OOXML) / .XLSM malware analysis — malicious · da48ba4f1d5195b6

MALICIOUS

Office (OOXML) / .XLSM

411.1 KB Created: 2021-02-12 08:06:11 UTC Authoring application: Microsoft Excel 15.0300

MD5: 888a3cf37a0e28d3d9b8f2f86a059d77 SHA-1: eb3e6cef3acdd08e23fdea8fcfa26f84a0d7b39c SHA-256: da48ba4f1d5195b666de1e6ac1e6270187808e160e66423f43a444aca2d9a831

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 Shell() calls. This indicates the macro is designed to execute a secondary payload, likely a downloader. ClamAV detection further confirms its malicious nature as a Dridex variant.

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` `121529a4e6dd20b831150501f02c82da91311f8df08d4a0d4142e6a005a9677a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2049 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` `98f0fd66a63f1e29eca41c1d2a36b9595e4e8a3b3fed2377343478161d407639`	vba-project	OOXML VBA project: xl/vbaProject.bin	16896 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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