RTF malware analysis — malicious · 2d4b731600a4f61e

MALICIOUS

RTF

241.6 KB First seen: 2022-04-04

MD5: 6c1eade8c98fe8aff319942f3fc60f47 SHA-1: 2470662f43a0d8217fb19c2650023fbe5a1b117f SHA-256: 2d4b731600a4f61e1e855908f1908af7338646d4a66925ef08b802f5d3b19fb8

123 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The RTF file contains multiple embedded OLE objects, with heuristics indicating that \objupdate forces OLE activation and the presence of a Composite Moniker. This suggests the file is designed to exploit OLE object vulnerabilities to execute malicious code upon opening. No scripts were extracted, and the document body contained only formatting information, limiting further analysis of the specific lure.

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` `5d7e6d33972061c8a2d3d58ab0650d20e3c12c3216f82c49dae6ad3a7433de13`	rtf-objdata-decoded	RTF \objdata at offset 0x7D0	27549 bytes
`objdata_01_off0000e844.bin` `1721aab459b68b884f13b5caf8aed48f2f1a5eb3d65c1b2ddac08c7c93062de4`	rtf-objdata-decoded	RTF \objdata at offset 0xE844	2632 bytes
`objdata_02_off0000fde7.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0xFDE7	12297 bytes

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