Win.Trojan.PonyStealer-9831667-0 — RTF malware analysis

Static analysis result for SHA-256 b66f37c760c2e8b9…

MALICIOUS

RTF

651.1 KB First seen: 2019-08-04
MD5: 4df11408897310c95286f2843e0e049d SHA-1: aff4ee136a51c1a0e22d88fe4087bb977cb6d1ec SHA-256: b66f37c760c2e8b9a4c0c49e56933666bd7486ce1149969c4efc46ef620bfbb1
320 Risk Score

Malware Insights

Win.Trojan.PonyStealer-9831667-0 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and triggers heuristics related to CVE-2017-8570, indicating it exploits this vulnerability. ClamAV identifies the file as Win.Trojan.PonyStealer-9831667-0, suggesting its purpose is to steal information. The embedded artifacts, particularly objdata_04_off00025124.bin, are flagged as suspicious and likely contain the stealer payload.

Heuristics 6

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • ClamAV: Win.Dropper.Remcos-6972666-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Remcos-6972666-0
  • \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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • OLE object data medium RTF_OBJDATA
    RTF contains 5 \objdata section(s) — embedded OLE objects

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000222e9.bin rtf-objdata-decoded RTF \objdata at offset 0x222E9 461 bytes
SHA-256: 206de2c9cd9db0d53e41bfcdc530ad5e19e7c3176125a5695cb462e4b91897b1
objdata_01_off000226b3.bin rtf-objdata-decoded RTF \objdata at offset 0x226B3 1467 bytes
SHA-256: e5d856b32ab8c7d22800ff933408c7974e935bdd1f89eb28111bf1727fe79ed6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): cscript //nologo %vbs%
objdata_02_off00023257.bin rtf-objdata-decoded RTF \objdata at offset 0x23257 1260 bytes
SHA-256: 5e60dfd240a20741904a8370aa4d813777d27d73f2509aafae0d3abf0987dd37
objdata_03_off00023c59.bin rtf-objdata-decoded RTF \objdata at offset 0x23C59 2633 bytes
SHA-256: e25d51623ff146dc9e025daeafee1cd9b145ae453796e8fdb17601b4ab3b203d
objdata_04_off00025124.bin rtf-objdata-decoded RTF \objdata at offset 0x25124 257422 bytes
SHA-256: 07c43cc64aba34336af4a136e78ef734dedf8a292321be0335625e0ade0f3773
Detection
ClamAV: Win.Dropper.Remcos-6972666-0
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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