Dridex Office (OOXML) / .XLSM malware analysis — malicious · 4a94021e5b258356

MALICIOUS

Office (OOXML) / .XLSM

410.4 KB Created: 2020-10-17 22:35:31 UTC Authoring application: Microsoft Excel 16.0300

MD5: 8d82b9280f808df8d9950763c15a5427 SHA-1: 04b4d5ebe15c2d7ccc9ac945443c3d3bcbc0b2e4 SHA-256: 4a94021e5b258356abad258f41d0d4f2b597fc95b2b038cefbe067bad86adfcc

220 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059 Command and Scripting Interpreter T1059.005 Visual Basic T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates an attempt to automatically execute code upon opening. ClamAV detection identifies it as a Dridex downloader variant, suggesting its purpose is to fetch and execute additional malicious components. The presence of a Workbook_Open macro and Shell() call strongly supports this attack pattern.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
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
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` `c521d101be0cd05146f85d09f1985757c9f5b3e6537cfaf217fb509b65f2c23a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1939 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `b9aa3b7d3688307572ec6f9346aa130a1f2f29ba681a36181bea99255430fbc9`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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