Dridex Office (OOXML) / .XLSX malware analysis — malicious · f451591b470a934d

MALICIOUS

Office (OOXML) / .XLSX

413.7 KB Created: 2021-02-26 12:20:29 UTC Authoring application: Microsoft Excel 16.0300

MD5: fb5e42ad7d3ad06f934a869d0b6b2f8c SHA-1: 168b86d471497b984ddacc877de74c54184cb007 SHA-256: f451591b470a934d1ef08937d9009f19e1d426651d87603d3cded34b54c53b6c

280 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 Excel macro-enabled document containing a Workbook_Open macro. This macro utilizes VBA character-shift decoding to construct and execute a shell command, likely to download and run a second-stage payload. ClamAV identifies the sample as a Dridex downloader.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA character-shift decoded Shell command critical OLE_VBA_ASC_CHR_SHIFT_SHELL

VBA auto-exec macro stores an encoded command string, decodes it with a Mid/Asc/Chr character-shift loop, and passes the recovered text to Shell. This is a high-confidence command stager.
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` `54338dcbed52f954280fa11f00999e5471cbb9b1f276944df76c5bdc222174ff`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	21021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `aef718952f8b470082bfe786054854e62c1b5c2f2b9417c5138d3e1988db0b1c`	vba-project	OOXML VBA project: xl/vbaProject.bin	32256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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