RTF malware analysis — malicious · 88a5bbb95741c125

MALICIOUS

RTF

408.8 KB First seen: 2019-01-12

MD5: 6f8de20e6b67edefedb8ae8071f24fd4 SHA-1: c62a458aac38920c37ffd481c394a7a940bfef3c SHA-256: 88a5bbb95741c12540ec9ebed53a41e0431933100f114a2e1117b0e30b1dd7e8

182 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple OLE objects and ".objupdate" directives, indicating it is designed to exploit vulnerabilities. Specifically, the "CVE_2017_8570" heuristic firing confirms the use of a Composite Moniker to drop an SCT script, which is a known technique for executing arbitrary code. The embedded OLE object data, particularly at offset 0xB5D2, is the likely source of this exploit.

Heuristics 6

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
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 7 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact info 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.

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000025.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x25	229 bytes
SHA-256: `bdf6de0a64b3411ca5229f989a8704bb9f2ac8eac0d3b0c83ab62136585dd012`
`objdata_01_off0000021a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x21A	195671 bytes
SHA-256: `3b2f72ab2ae943d66f3050dd8c940cb46e10099d41019770501d40fdf7f2145e`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.86, consistent with packed or encrypted content.
`objdata_02_off000635ca.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x635CA	1092 bytes
SHA-256: `d4bc1acb790f4d56cd06070639d405330d630c9694d98fa2b3b82c6bf73da07d`
`objdata_03_off00063e85.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x63E85	636 bytes
SHA-256: `beeb549ebc57e264e8e77fa6b4cfd820bf95bef53865f2e41c70d776aef38923`
`objdata_04_off000643af.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x643AF	393 bytes
SHA-256: `cc434f8b829894f9e2d49a62c39440162c7bcebb137b5685ff63adca2384b98a`
`objdata_05_off000646f5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x646F5	914 bytes
SHA-256: `27bd5b1e1679863c8cd0257c9eb6b6ee3106b285add9281353de171771ae84d6`
`objdata_06_off00064e80.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x64E80	2633 bytes
SHA-256: `fe11c27d916ab897eb94064e9631d8a29c847a6db39259bef31578da8d19fdf5`

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