RTF / .DOC malware analysis — malicious · 3b04099668e48324

MALICIOUS

RTF / .DOC

286.2 KB First seen: 2022-03-01

MD5: a1c622e1d2598302c332189a6406587a SHA-1: d924e581c3eed5b8193fd04a0bae518f398f5b4d SHA-256: 3b04099668e48324b36fc337bfa297ff0119fdda7b0667a53eba4f038dfe701a

123 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple OLE objects, with specific heuristics indicating the use of \objupdate and Composite Monikers. This strongly suggests the document is designed to exploit OLE object vulnerabilities to execute embedded code. No document body text or scripts were extracted, limiting further analysis of the specific payload.

Heuristics 4

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000007d0.bin` `e11eacf3727acd63cb2f28370f74cc5186931fed5f6c41a764dd3345e3535a62`	rtf-objdata-decoded	RTF \objdata at offset 0x7D0	49511 bytes
`objdata_01_off00019ab4.bin` `ea39900f3f35bed9f78c8f6402daf7e23b4f89a2f7c10ee6f3ec6918b4c4be7e`	rtf-objdata-decoded	RTF \objdata at offset 0x19AB4	2632 bytes
`objdata_02_off0001b057.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x1B057	12297 bytes

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