RTF malware analysis — malicious · 54e13ec5977b14b3

MALICIOUS

RTF

468.5 KB First seen: 2019-05-16

MD5: e8cb5f2204728af944e077c384cead28 SHA-1: 767b53f21bc2fea9f2b61b0fc1c8c1fd863124fa SHA-256: 54e13ec5977b14b305995dae7a09541bdef9434c4a4542a1210dd63c083355c8

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-6864804-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-6864804-0
\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_off00000055.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x55	563 bytes
SHA-256: `5390c7282688cb0e3b5c719323e6583fa62a75f1e492d851c0797e0ac64d895f`
`objdata_01_off000004ed.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4ED	1539 bytes
SHA-256: `4ac2c4601326408857ad3360389ef0679e30432473891efd5a9b8e34299df596`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): cscript //nologo %vbs%
`objdata_02_off0000111f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x111F	1309 bytes
SHA-256: `d498ee11d7f7fbd4b4c0030e3bfc7444544781475b8a2adfdf885f8b3a11d66b`
`objdata_03_off00001b80.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1B80	2633 bytes
SHA-256: `e25d51623ff146dc9e025daeafee1cd9b145ae453796e8fdb17601b4ab3b203d`
`objdata_04_off00003051.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3051	233663 bytes
SHA-256: `69ce094d1ab660de887ce5c1c3d852445451ffbeafc4741b59a7f8155778d4af`
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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