RTF malware analysis — malicious · 1a1295ecf5c86f90

MALICIOUS

RTF

10.8 KB First seen: 2019-02-10

MD5: 5d99176c357d4c3c4a04adc6908035d7 SHA-1: f7c952ace023c2df1bd2337a421c075c69360269 SHA-256: 1a1295ecf5c86f90f486071f6e891c9d66ca14abcb1f7805fb3c5b38f357448a

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and triggers critical heuristics for CVE-2017-11882, indicating exploitation of the Equation Editor vulnerability. This exploit allows for the execution of arbitrary code, likely as part of a spearphishing attachment campaign.

Heuristics 6

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
Automatically linked OLE object high RTF_OBJAUTLINK

RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
\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_off0000003f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3F	3622 bytes
SHA-256: `921f4b14e8109a35595782e7528da0d87d0c706ed95c1c2d5d437e888578e818`
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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