Dridex Office (OOXML) / .XLSM malware analysis — malicious · a9270bb54962c3b3

MALICIOUS

Office (OOXML) / .XLSM

413.4 KB Created: 2020-05-31 09:10:59 UTC Authoring application: Microsoft Excel 16.0300

MD5: 0be84a726b8d0bdac0aa13838740184a SHA-1: 1b2064a1b5197bf762a94ddcb13d944b531ae612 SHA-256: a9270bb54962c3b37c0fe460bbd7eaf8baff2be1c982665930d9912ff496e7e9

320 Risk Score

Malware Insights

Dridex · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an XLSM file containing VBA macros, specifically a Workbook_Open macro that utilizes Shell() and CreateObject() calls. ClamAV detections identify it as a Dridex downloader variant. The primary function of the embedded VBA code is to download and execute a secondary payload from a remote source, as indicated by the downloader heuristic and the ClamAV signatures.

Heuristics 8

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
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
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `c648dda928e292f5d57de2d0a7893413239c56168f7a8dc53a2931cc2f0e316b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	4646 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `6ac4adc5ee14c7ab596439db6e28239df7ac274e96e59b7d829d68e14d659ab1`	vba-project	OOXML VBA project: xl/vbaProject.bin	22016 bytes
Detection ClamAV: Xls.Malware.Sload-7135989-0 Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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