Dridex Office (OOXML) / .XLSM malware analysis — malicious · bb54d811f6fc04e5

MALICIOUS

Office (OOXML) / .XLSM

377.5 KB Created: 2021-03-10 12:56:46 UTC Authoring application: Microsoft Excel 15.0300

MD5: 3172ab97ce7288a555cdd44a78757961 SHA-1: a22f866dd23b01381668a3134f4a627aa1917022 SHA-256: bb54d811f6fc04e5e98feddd6524e52b4eca7690cb1a40fae7567fa49b2a9bdd

268 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The critical ClamAV heuristic firings indicate this file is a Dridex dropper. The presence of a Workbook_Open macro (OLE_VBA_WBOPEN) strongly suggests that VBA code is executed automatically when the document is opened. This code is likely responsible for downloading and executing a second-stage payload, consistent with the behavior of Dridex droppers. The GetObject call (OLE_VBA_GETOBJ) further supports the execution of external code.

Heuristics 7

ClamAV: Doc.Dropper.Dridex-9845759-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Dridex-9845759-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject 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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `94fc71646d9d0a22262186b693f8327154d50b37248dfae33457c22031daa68e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	15261 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 109 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `e3d9daf7163cb162c3ebc80ae510cb97263a83cc5167bf0d08485e830f7ed568`	vba-project	OOXML VBA project: xl/vbaProject.bin	62976 bytes
Detection ClamAV: Doc.Dropper.Dridex-9845759-0 Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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