RTF malware analysis — malicious · 1af7cb30b1b95858

MALICIOUS

RTF

217.4 KB First seen: 2022-04-11

MD5: 8bb83eb5e71f3ec7c1360ee486853709 SHA-1: 28ed0364b2041e02feb8ebc88d3c48ff27e6f3b6 SHA-256: 1af7cb30b1b958585f870a42b8a979ff01bdc19220ba7024f76e26d19075c7e9

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 trigger OLE activation. This suggests the document is designed to exploit vulnerabilities related to OLE object handling, likely leading to the execution of embedded malicious code. The extracted artifacts, objdata_00_off000007d2.bin, objdata_01_off00008778.bin, and objdata_02_off00009d1b.bin, are likely components of this exploit.

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` `b8ae64a05494e30d3b72c570ffc600aea14b3de576df7238e3e37e22c9d5cbfb`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15635 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008778.bin` `64b1f15a0e9494bf93ea2a1e9ea1b7d807d3f377db217eed0f95ae662942e168`	rtf-objdata-decoded	RTF \objdata at offset 0x8778	2632 bytes
`objdata_02_off00009d1b.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9D1B	12297 bytes

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