Dridex Office (OOXML) / .XLSM malware analysis — malicious · 8a3ab066aa4e4e7b

MALICIOUS

Office (OOXML) / .XLSM

410.3 KB Created: 2020-05-20 00:01:59 UTC Authoring application: Microsoft Excel 16.0300

MD5: 19baf60aa19280490168a26cac1319b8 SHA-1: 225fb7f78499ec2f84fe1807a220f3cd1d2f4986 SHA-256: 8a3ab066aa4e4e7bc86ef8149b8494addb4e2096c02d03eceecb2b01c18a5907

280 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This XLSM file contains a Workbook_Open macro that utilizes VBA character-shift decoding to execute a command via Shell(). The ClamAV signature 'Xls.Downloader.DridexGreen09213-9890103-0' strongly suggests this is a Dridex downloader variant. The macro's primary function 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` `2d225b4db07075a80cd79da3690c2616afed4463ce129a6938e1f7bdcb7e8297`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1628 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` `0c6e4c01690bd06afff452b69db9736ea51b2aab7558a9a7f051ff8fbbe40cef`	vba-project	OOXML VBA project: xl/vbaProject.bin	15872 bytes

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