RTF malware analysis — malicious · a6b8931ab765d423

MALICIOUS

RTF

217.6 KB First seen: 2022-04-18

MD5: b65f143983e75fe14717b7591f2315c6 SHA-1: 62cac3f819316a7d50b2e0cf1e86d05ff551f491 SHA-256: a6b8931ab765d42308400301dd116dbee11fafe3a87ce7482ee605c979c82b3e

154 Risk Score

Malware Insights

MITRE ATT&CK

T1559.002 Component Object Model Hijacking T1059.001 PowerShell

The RTF document contains multiple OLE object data sections and triggers OLE activation via \objupdate. This suggests the file is designed to exploit vulnerabilities related to OLE object handling, likely to embed and execute a malicious payload. The presence of multiple embedded OLE objects, including one identified as a suspicious extracted artifact, indicates a multi-stage attack. No scripts were directly extracted, but the OLE object data itself is the primary indicator of malicious activity.

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` `1c963ca0850392075941e5c180f0ba4a29aed35bfec1bb143775178c8a200441`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00008866.bin` `7b74a822cc160a0a46dc6db6fcbc7a2291eea6fdb58fa98ed0d9b3907cb827e4`	rtf-objdata-decoded	RTF \objdata at offset 0x8866	2632 bytes
`objdata_02_off00009e09.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9E09	12297 bytes

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