Malicious RTF — malware analysis report

Static analysis result for SHA-256 12fdeb666293ea69…

MALICIOUS

RTF

8.2 KB First seen: 2019-05-31
MD5: 2cf127dc4f6c09cfbea2f302804e32bc SHA-1: 87d2dc89dd6452fd4a411a9fbaa7e547c34722d2 SHA-256: 12fdeb666293ea69a3bf3fa73c62d1bf74668cfc56ac5158fe83b92b8ef1efc0
140 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor, a known vector for exploiting vulnerabilities like CVE-2017-11882. The ".objupdate" directive forces the activation of this embedded object, leading to arbitrary code execution. This is a common method for delivering secondary payloads, hence the high confidence in exploitation for client execution.

Heuristics 4

  • 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
  • \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_off00000031.bin rtf-objdata-decoded RTF \objdata at offset 0x31 4157 bytes
SHA-256: ff3a93b57445409fc3cce57740f3ddb584c5f9323ad0776cec90a54a40606696

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