Dridex Office (OOXML) / .XLSM malware analysis — malicious · e7d87f20f18e03ad

MALICIOUS

Office (OOXML) / .XLSM

414.2 KB Created: 2021-02-16 12:28:34 UTC Authoring application: Microsoft Excel 12.0000

MD5: 52351caf50e1cc6245bbfa982db4639c SHA-1: 306a0fff89e2d78097f106c69e3940fa60fb7f66 SHA-256: e7d87f20f18e03adfb4e1eae2ae591abb80b7b0fefa2e274a4763c9fd141aa3c

280 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

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

This XLSM file contains a Workbook_Open macro that utilizes a character-shift decoder to execute a shell command. The ClamAV signature indicates this is a Dridex downloader, and the macro's purpose is to download and execute a second-stage payload.

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` `05f509401044b7e86d49c471c81d555ac207234df79a5d389f78e1f62374814a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	20786 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` `d99eeb766c29e4b7cd46cb283c238ddb55cd7c8b442ee3e3e5c871c9104d25b6`	vba-project	OOXML VBA project: xl/vbaProject.bin	32256 bytes

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