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

Static analysis result for SHA-256 5720a02a862a3798…

MALICIOUS

RTF

249.4 KB First seen: 2020-05-25
MD5: cec7d5730c6dc8bc98e260f19d6c21b0 SHA-1: 713fad1a51494d68af0c3f71958a06a618216209 SHA-256: 5720a02a862a37981f268865e03708f9dd24fb3e7d298ff8b878c94519d35bde
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.Trojan.PonyStealer-9831667-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.PonyStealer-9831667-0
  • \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 51771 bytes
SHA-256: 5be460bddb61bc2a0b699e4f8d30b60250afa78acd1835b86d4d1417f5eda1e2
Detection
ClamAV: Win.Trojan.PonyStealer-9831667-0
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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