Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 2ac6eafd30aa4e89…

MALICIOUS

RTF / .DOC

59.5 KB First seen: 2023-03-06
MD5: 9f73a0241ccb7f62ee86acf1ce1537cf SHA-1: 9501f7fe11b73d75d11662d87b37c6780f8c828c SHA-256: 2ac6eafd30aa4e89241f9a73b49b104e415e37430ddbe8b692bc71041a868787
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1059.005 PowerShell

The sample is an RTF document that contains an embedded OLE object, specifically leveraging the Equation Editor vulnerability. The document body presents a lure related to financial audits, instructing the user to 'Enable editing' to bypass security measures. This combination strongly suggests an exploit delivery mechanism, likely aiming to execute a malicious payload.

Heuristics 5

  • 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.
  • Equation Editor CLSID critical 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000026c8.bin
7031dec96271158645f01061fa740e5f115f51783b15a1d19baa423c9df7795d
rtf-objdata-decoded RTF \objdata at offset 0x26C8 4176 bytes