RTF malware analysis — malicious · b3066a2d1da7ea21

MALICIOUS

RTF

12.7 KB First seen: 2018-11-05

MD5: b2fbe13473e56694c5a45436e07f5699 SHA-1: 16643bcc6195819847764bc08d3d64234a4deb00 SHA-256: b3066a2d1da7ea21c07db1319d670eebfd4b702eabf9b9738817c1c67b50a693

260 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains critical heuristics indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882). The presence of OLE object data and an update flag further supports this, suggesting the document is designed to trigger code execution upon opening. The ClamAV detection name directly confirms the exploit. The likely goal is to download and execute a secondary payload, typical of this exploit.

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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000a14.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA14	5150 bytes
SHA-256: `869cddc220516ec132f434696a3c66a41b9c52abc8b4f3bd47e8214039461235`
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, URLDownloadToFileW, CreateProcessW

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