Malicious RTF — malware analysis report

Static analysis result for SHA-256 6ef033bf1828dbe4…

MALICIOUS

RTF

16.7 KB First seen: 2019-09-30
MD5: 903b60138c46a0d30c9e051bfffe6875 SHA-1: ebefde47197edfdd58e857a3822c935063e7ad02 SHA-256: 6ef033bf1828dbe44332d544b6b245cc360baaff1852c31fdbefe422f43ff460
240 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data, specifically identified as a payload for CVE-2017-11882 exploiting Microsoft Equation Editor. This technique is commonly used to execute arbitrary code, likely leading to the download and execution of a secondary malicious payload. The presence of the Equation Editor CLSID and Ole10Native stream strongly indicates this exploit.

Heuristics 6

  • 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.
  • \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_off00001c62.bin rtf-objdata-decoded RTF \objdata at offset 0x1C62 4694 bytes
SHA-256: d412ef06d9324282bf1fe04e3855a8a4109c1bf3394ee7c77d3c4f681fb80a23

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