RTF malware analysis — malicious · 5aac59b0712cab0c

MALICIOUS

RTF

10.8 KB First seen: 2019-01-20

MD5: ed990e94dcd30a36e94b60954bc7be7b SHA-1: 5a942103b0c4142a016e1ba3b6ce6846166cfe02 SHA-256: 5aac59b0712cab0cff03510506c25866ebef352466b09560125cc3ca73f3e18e

200 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE object data and triggers the CVE-2017-11882 vulnerability, which is a known exploit for Microsoft Equation Editor. This exploit allows for the execution of arbitrary code, likely leading to the download and execution of a secondary payload. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 5

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.
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
\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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3B	3622 bytes
SHA-256: `1bf70d9c7c8e8e8c9f43311bf0ba1a323916f714e239c3c493f4d18c79abd2cb`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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