Malicious RTF — malware analysis report

Static analysis result for SHA-256 c7c78c487be8547e…

MALICIOUS

RTF

298.7 KB First seen: 2019-03-18
MD5: ea12815a670836a7bd1327c4a7ae336f SHA-1: aed09fbd4f29a0abcf333445786c3ca14f6b32d5 SHA-256: c7c78c487be8547e39593b2ac172479c38722eff0eef3670ac1dbb9bf58c8749
300 Risk Score

Malware Insights

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

The RTF file contains critical indicators of the CVE-2017-11882 Equation Editor vulnerability, including specific CLSID and Ole10Native stream findings. This exploit is known to facilitate arbitrary code execution, typically used to download and run further malicious content. The presence of OLE object data and the ".objupdate" directive further support the exploitation mechanism.

Heuristics 7

  • 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
  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • 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
  • 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_off000014a0.bin rtf-objdata-decoded RTF \objdata at offset 0x14A0 89648 bytes
SHA-256: bfa7670dcf436083f4c0d25120996e4d50ab4c22cd87338b5920712222aae3c3

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