Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 596b8f738a91b94e…

MALICIOUS

RTF / .DOC

212.7 KB
MD5: 0a26596952aa7bef983e6acd5888efe2 SHA-1: 9990b79e174d5c9d9852fe0d8f1c58b4fd8d5747 SHA-256: 596b8f738a91b94ef3993e14dde4064f7062dda49fc12926601b20637e1cbc6e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an RTF document containing multiple embedded OLE objects, with specific heuristics indicating the use of ` ield` and ` ldinst` to trigger OLE activation. The document body contains a common lure, 'Please click Enable Editing to view the document.', which is designed to bypass macro security settings and encourage user interaction. This suggests the document is intended to drop or execute a malicious payload upon enabling editing.

Heuristics 6

  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000bd0.bin
6519222a43168c98a4672f4ab3cd3e00994b214a790f9eb04ae06a618c8f15a5		 rtf-objdata-decoded RTF \objdata at offset 0xBD0 12636 bytes
objdata_01_off00006f8b.bin
0d5d09fb7e87d140659b8f662dc3a7b92cd848450a431d1974047996c57d1f01		 rtf-objdata-decoded RTF \objdata at offset 0x6F8B 2632 bytes
objdata_02_off00008526.bin
cfdf79b95584afe599f8bd01e391d8904839d9495e407a353433d3f5e3be3602		 rtf-objdata-decoded RTF \objdata at offset 0x8526 12261 bytes

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