RTF / .DOC malware analysis — malicious · 4bbf54f3fff6e970

MALICIOUS

RTF / .DOC

217.6 KB First seen: 2022-04-29

MD5: 94a6462ba19ea26fe5c070b53bceeedf SHA-1: b66a23ee5d333ab6b1aa69c8e46add29b3ad1f1f SHA-256: 4bbf54f3fff6e970356086e462e4c9bfe9784bcc26f183c74881250f5354ce3c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple embedded OLE objects, with specific heuristics indicating the use of \objdata and \objupdate, strongly suggesting an attempt to exploit OLE object activation. One of the extracted artifacts, objdata_00_off000007d2.bin, is flagged as suspicious due to script execution terms. This indicates the document is likely designed to deliver and execute a malicious payload via OLE object vulnerabilities.

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` `057154222edb7c775c1bbd1b7e22f83eac1b39d7ed48c3d1db83c173ae2dd55b`	rtf-objdata-decoded	RTF \objdata at offset 0x7D2	15751 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off0000886a.bin` `69f64299837b9bdce8c52fe4f05181569f28511801c1b3d711966300926e8171`	rtf-objdata-decoded	RTF \objdata at offset 0x886A	2632 bytes
`objdata_02_off00009e0d.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x9E0D	12297 bytes

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