Malicious RTF — malware analysis report

Static analysis result for SHA-256 bb0a569bcb718ee5…

MALICIOUS

RTF

7.1 KB First seen: 2022-03-22
MD5: 8174409f15fa8d4cc865774ba99abe24 SHA-1: 15f5e34ed4bec0e1602ea4386038c24448cd7581 SHA-256: bb0a569bcb718ee58f6c3e61e359b654293b4046b8f1b4557a12524830ae50ad
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened. The presence of the ".bin" file and the specific RTF object data strongly indicate this exploit is intended to download and execute a second-stage payload.

Heuristics 4

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003e.bin
28e2dcf7cdde3b2289b9ef98b016946036727088200be4667abd8476f0567848		 rtf-objdata-decoded RTF \objdata at offset 0x3E 3620 bytes

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