Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 d3a0b7c5a1eafbf7…

MALICIOUS

Office (OOXML) / .DOC

543.2 KB Created: 2021-12-03 04:23:00 UTC Authoring application: Microsoft Office Word 15.0000
MD5: 11a44ac4c0c2f80276502eb216448fa8 SHA-1: 94cc4db1a464d8e2072eab185b9c68bbae2c53eb SHA-256: d3a0b7c5a1eafbf7d381b6ee064083496476163da5dfed53096fac36c2b30738
150 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The sample exploits CVE-2023-36884 by referencing an external RTF file via an OLE object relationship. This indicates an attempt to load and execute a secondary payload from the URL https://mohgovsg.bahariafoundation.live/5320/1/13/2/0/0/0/m/files-1ddf5195/file.rtf. The document body contains information about COVID-19 cases and travel restrictions, likely a lure to encourage users to click on the malicious link.

Heuristics 5

  • CVE-2023-36884 — external RTF auto-load relationship critical CVE likely CVE_2023_36884
    Document auto-load relationship references a remote RTF file (https://mohgovsg.bahariafoundation.live/5320/1/13/2/0/0/0/m/files-1ddf5195/file.rtf), matching the stronger Storm-0978/RomCom external-RTF delivery shape. Plain clickable hyperlinks are not enough for this CVE rule.
  • OOXML OLE2Link remote document — CVE-2017-8759 related high CVE related CVE_2017_8759_RELATED
    Document contains an o:OLEObject Type=Link whose external oleObject relationship fetches a remote Office-looking document. That is the OOXML OLE2Link staging shape used by CVE-2017-8759 campaigns when the remote document/WSDL supplies the SOAP moniker payload; the local file alone does not contain the WSDL body needed for an exact match.
  • External OLE object relationship high OOXML_EXTERNAL_OLE_OBJECT
    Document contains an oleObject relationship whose target is an external HTTP(S) URL. Office resolves this through OLE/object update paths rather than as a normal user-clicked hyperlink.
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: https://www.moh.gov.sg/covid-19/general/resources
  • 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 https://www.moh.gov.sg/covid-19/general/resources
    • https://mohgovsg.bahariafoundation.live/5320/1/13/2/0/0/0/m/files-1ddf5195/file.rtf
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape
    • http://schemas.openxmlformats.org/officedocument/2006/relationships/oleobject

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
emf_00.emf
1833637d2bb49186e0667ae0896ecc4d5b00b3383529f74edb75cad8748cd9b3		 ooxml-emf OOXML EMF part: word/media/image1.emf 52 bytes

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