Malicious RTF — malware analysis report

Static analysis result for SHA-256 b27624f7709cbfb8…

MALICIOUS

RTF

53.7 KB Created: 2018-04-07 First seen: 2019-03-10
MD5: 5db251a310eba0b050d5c20719c4a20d SHA-1: 24ea469ea5c2855901e6dfff8f3689f6edf91287 SHA-256: b27624f7709cbfb83901be14ac6ab9466d93830a6155e36bd92b4db9ce8da17d
282 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document containing an embedded OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution when the object is activated. The document body explicitly states it is a PoC for this exploit.

Heuristics 8

  • 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
  • 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: 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 2 \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.
  • 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://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000957d.bin rtf-objdata-decoded RTF \objdata at offset 0x957D 3546 bytes
SHA-256: 3dbfc6e393e2848bdb4e3c2f6ab26c0d0e209f999785ec1f0efad29c1594bdc5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS
objdata_01_off0000b654.bin rtf-objdata-decoded RTF \objdata at offset 0xB654 3546 bytes
SHA-256: 72ab98b63049ae1f3a33933892d4b5e6b80265cbed08166ddc6a00b115b18530

Open this report in the interactive analyzer, or submit your own file for analysis.