Malicious RTF — malware analysis report

Static analysis result for SHA-256 fbe01ca1ab0f56e9…

MALICIOUS

RTF

14.3 KB First seen: 2018-07-18
MD5: c50280f9beb8d2b89f50b2f7fb2cde6a SHA-1: 22a44d308b02991c3ac73d587147dffda29885ad SHA-256: fbe01ca1ab0f56e9a88d746dba804274cdf3f98b77ca18996fef67f5726fbffa
320 Risk Score

Malware Insights

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

The file is an RTF document that contains an embedded OLE object exploiting the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to download and execute a second-stage payload, indicating a malicious intent to compromise the user's system. The ClamAV detection further confirms the malicious nature of the file.

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
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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_off000014c0.bin rtf-objdata-decoded RTF \objdata at offset 0x14C0 4659 bytes
SHA-256: e074f8293908a5ac7024944b5bb61dcd502098c95ad5d060882a5010b8806e0a

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