RTF malware analysis — malicious · 342913c3dbf38f1f

MALICIOUS

RTF

74.9 KB First seen: 2019-01-11

MD5: b895e5eec0c1f8b3b6bc5467e077f350 SHA-1: 36f9597f37f9d05d3c349e17ef528be752fe1346 SHA-256: 342913c3dbf38f1f33d03d3a59f7e05cd4e1e93015306d08bbb30904c7df3d87

242 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution, and the presence of shellcode API strings in a statically triaged artifact suggests it's designed to download and execute a second-stage payload from the URL http://uploadtops.is/1//f/pina0dU. The document body, written in Polish, attempts to lure the user by discussing a potential erroneous bank transfer, a common social engineering tactic.

Heuristics 7

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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
Suspicious extracted artifact medium 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.
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://uploadtops.is/1//f/pina0dU In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000c1f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC1F	23151 bytes
SHA-256: `9afa384e9439fe7ab00710121ca98923ad699cf7c18d468d3a500585ec6501f6`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL, SC_PEB_ACCESS, SC_GETPC_CALL Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, ExitProcess, URLDownloadToFileA, ShellExecuteA

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