Malicious RTF — malware analysis report

Static analysis result for SHA-256 02a69029bf2b0c97…

MALICIOUS

RTF

7.9 KB Authoring application: Riched20 6.3.9600 First seen: 2019-05-10
MD5: c5117ac5232ed7980d1672b820ac1a8d SHA-1: 02b16bf68b44828aa253b526aa1e8f1896f49250 SHA-256: 02a69029bf2b0c97bfb9ddbbe6e89409f1b11007a92d8ca4a6df6597b72eb453
360 Risk Score

Malware Insights

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

The RTF file contains multiple indicators of the CVE-2017-11882 exploit, specifically related to the Equation Editor object. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of OLE object data and the specific ClamAV detection further confirm the malicious nature of the file.

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
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • \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.
  • Suspicious extracted artifact high 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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000fe.bin rtf-objdata-decoded RTF \objdata at offset 0xFE 3546 bytes
SHA-256: 97ad9e397eeeabec637db951725fc3a5f145e8d8a32de0be7e06cd3ccdd7011a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): cmd.exe /c calc.exe AAAAAAAAAAAAAAAAAAAAAAAA C

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