RTF malware analysis — malicious · 3e24f2d3569d5fb1

MALICIOUS

RTF

217.4 KB First seen: 2022-04-14

MD5: f8a01e196e6773dc74b0ec5dec799d28 SHA-1: 6893e583e1ea0c449fcbe815013c37d66113e3f0 SHA-256: 3e24f2d3569d5fb109388119787a403cf0e2e32b7e75070fcee79379a6acbdc9

154 Risk Score

Malware Insights

MITRE ATT&CK

T1559.002 Component Object Model Hijacking T1204.002 Malicious File

The RTF document contains multiple OLE objects, with specific heuristics indicating the use of \objdata and \objupdate to force OLE activation. This suggests the document is designed to exploit vulnerabilities within OLE object handling to execute embedded code. The extracted artifacts, objdata_00_off000007d2.bin, objdata_01_off000087c2.bin, and objdata_02_off00009d65.bin, are likely components of this exploit chain.

Heuristics 5

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
Suspicious extracted artifact medium 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007d2.bin` `075040ced9a888450e5418de2f20c12e8bf9fb64bf22b682723cfa2baabb5d3a`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off000087c2.bin` `36dcadcd9dba6c796320cf103eee4d99a0cf65218f74bac40d0f472a6487a1f8`	rtf-objdata-decoded	RTF \objdata at offset 0x87C2	2632 bytes
`objdata_02_off00009d65.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9D65	12297 bytes

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