Malicious RTF — malware analysis report

Static analysis result for SHA-256 c7a27f63b3bd331f…

MALICIOUS

RTF

8.1 KB First seen: 2019-04-18
MD5: 802483668caf3936ac33f1807299cbc2 SHA-1: 6e8bad9487fc16b28a870759c37972556e37f192 SHA-256: c7a27f63b3bd331fc44e133d391244b6fee10c35367b2f2498834c3b2507ca77
220 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers heuristics related to Equation Editor exploits and OLE activation. ClamAV identifies this as Rtf.Exploit.CVE_2017_11882-6584355-1, indicating a known vulnerability exploitation. The primary attack vector is the exploitation of CVE-2017-11882 via the embedded Equation Editor object, leading to arbitrary code execution.

Heuristics 5

  • 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
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • 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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4137 bytes
SHA-256: 3025e1d8d8a31dd619acfb8c50e271bc051d3b29348e59b01bd0cac5937fd864