Malicious RTF — malware analysis report

Static analysis result for SHA-256 fdcd2c40b774577d…

MALICIOUS

RTF

19.2 KB First seen: 2018-09-04
MD5: b395f1589b3b50ec569cf86d979c0c8d SHA-1: fc342916176f38a856c30cb01eebc00e1b1be9f9 SHA-256: fdcd2c40b774577d3ed295f19c8d84bade5af1f97208a2803597f76d57d5823a
100 Risk Score

Malware Insights

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

The sample is an RTF document containing OLE object data and an \objupdate directive, indicating an attempt to exploit OLE activation for code execution. The presence of these elements strongly suggests a spearphishing attachment used to deliver a malicious payload. No specific family could be identified from the available evidence.

Heuristics 3

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001675.bin rtf-objdata-decoded RTF \objdata at offset 0x1675 4648 bytes
SHA-256: 0c62a9983eb50b7d58cedc5d663413acb0dd8b794656cb9abd5547f96f316fd1