RTF / .DOC malware analysis — malicious · 4b0d21f58347c62f

MALICIOUS

RTF / .DOC

382.9 KB

MD5: c0f8f2fc481e9be7141d84b401edf1f7 SHA-1: ab1dbe841b083ea886c9023307c0527f7bfbfff3 SHA-256: 4b0d21f58347c62f76445c6aa17a21dd00970f235734a1d1db4a40ee5a8b7c45

140 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The RTF document contains multiple embedded OLE objects, with specific heuristics indicating the use of `\objdata` and `\objupdate` to trigger OLE activation. This suggests an attempt to exploit vulnerabilities related to OLE object handling, likely to execute a malicious payload. The extracted artifacts, named `objdata_*.bin`, are the direct result of this OLE object embedding and are the primary indicators of compromise.

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_off000007d1.bin` `f94008666dbeb08c798822ad2bc7e884f44978ccdfb11f9e8c9bec799bc7edd2`	rtf-objdata-decoded	RTF \objdata at offset 0x7D1	97116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00031d7e.bin` `7a8598fff434e2b582d3d87e32bb1d356d28f288618d4b03cf39e56767823039`	rtf-objdata-decoded	RTF \objdata at offset 0x31D7E	2632 bytes
`objdata_02_off00033321.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x33321	12297 bytes

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