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

Static analysis result for SHA-256 37eca58386fbf9c1…

MALICIOUS

Office (OOXML) / .DOC

1.71 MB Created: 2022-09-23 10:51:36 UTC Authoring application: Microsoft Office Word 14.0000
MD5: c8e7993906c147b7918e9612c111aeea SHA-1: 09b5a73e62b803724dd54381f1d98b4b67d64451 SHA-256: 37eca58386fbf9c1e381f88776435565623e3d2d1e2b01218f7717b963449735
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: User Execution T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1566.002 Phishing: Spearphishing via Service

The OOXML document contains external OLE object relationships and OLE2Link objects that point to a remote RTF file. These are indicative of exploits targeting CVE-2017-8759 and CVE-2023-36884, which are known to facilitate the execution of malicious code from external sources. The document likely serves as a lure to download and execute a second-stage payload.

Heuristics 3

  • CVE-2023-36884 — external RTF auto-load relationship critical CVE likely CVE_2023_36884
    Document auto-load relationship references a remote RTF file (https://srilanka-navy.lforvk.com/135/1/334/2/0/0/0/m/files-4fdaf6c7/file.rtf), matching the stronger Storm-0978/RomCom external-RTF delivery shape. Plain clickable hyperlinks are not enough for this CVE rule.
    URL https://srilanka-navy.lforvk.com/135/1/334/2/0/0/0/m/files-4fdaf6c7/file.rtf
    • http://schemas.openxmlformats.org/officedocument/2006/relationships/oleobject
  • 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.
    URL https://srilanka-navy.lforvk.com/135/1/334/2/0/0/0/m/files-4fdaf6c7/file.rtf
  • 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.
    URL https://srilanka-navy.lforvk.com/135/1/334/2/0/0/0/m/files-4fdaf6c7/file.rtf

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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