RTF malware analysis — malicious · 2ad3289245c4165e

MALICIOUS

RTF

944.9 KB First seen: 2019-04-18

MD5: ab231416dd842ff4647f5132f77c6822 SHA-1: 3cb01c8288419a6521944019b8c7eeb5ef91372c SHA-256: 2ad3289245c4165ee79c99da13f7d9fbbb078cb3612af72d46b876443c82dc22

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE objects with composite monikers, indicative of CVE-2017-8570 exploitation. This vulnerability is known to drop SCT scripts, which are then likely executed to download and run a secondary payload. The ClamAV detection and heuristic firings strongly suggest a dropper functionality.

Heuristics 6

Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570

RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
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.
ClamAV: Rtf.Dropper.Agent-6862923-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-6862923-0
\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.
Suspicious extracted artifact high 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.
OLE object data medium RTF_OBJDATA

RTF contains 5 \objdata section(s) — embedded OLE objects

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000150b5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x150B5	461 bytes
SHA-256: `206de2c9cd9db0d53e41bfcdc530ad5e19e7c3176125a5695cb462e4b91897b1`
`objdata_01_off0001547f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1547F	1467 bytes
SHA-256: `e5d856b32ab8c7d22800ff933408c7974e935bdd1f89eb28111bf1727fe79ed6`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cscript //nologo %vbs%
`objdata_02_off00016023.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16023	1260 bytes
SHA-256: `5e60dfd240a20741904a8370aa4d813777d27d73f2509aafae0d3abf0987dd37`
`objdata_03_off00016a25.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16A25	2633 bytes
SHA-256: `e25d51623ff146dc9e025daeafee1cd9b145ae453796e8fdb17601b4ab3b203d`
`objdata_04_off00017ef0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x17EF0	434777 bytes
SHA-256: `971f9e2a1a3d479f5c96f61b79ae34697c8e226f7cd4dfb43742ee3ed66391dc`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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