Malicious RTF — malware analysis report

Static analysis result for SHA-256 5f19b454065bb0c8…

MALICIOUS

RTF

841.4 KB Created: 2018-03-12 22:28:00 First seen: 2018-04-30
MD5: b34f6511925adef2e813dcc4e78affcc SHA-1: aa28bda53d775b6a975d31ed216c5a354edac33a SHA-256: 5f19b454065bb0c8c2e12bf75ebce7d40a52194ffb088ef8ccfdf5fd1627af4d
262 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects and triggers an ".objupdate" command, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute a secondary payload.

Heuristics 6

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • ClamAV: Xls.Downloader.Generic-6750544-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6750544-0
  • \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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 10 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c4d.bin rtf-objdata-decoded RTF \objdata at offset 0x2C4D 28731 bytes
SHA-256: 80e97cfb0d8458324a1c1cd95c7e65ac40836d7473f7a15567642276ad844668
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00016c8e.bin rtf-objdata-decoded RTF \objdata at offset 0x16C8E 28731 bytes
SHA-256: b501f62d047e3cf444f09f080017c68da3db70511365da4000f2e708b95b9322
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_03_off0003ed10.bin rtf-objdata-decoded RTF \objdata at offset 0x3ED10 28731 bytes
SHA-256: 1a9da3847b67f90edbc95324acec2b0eb44f331bb03c9450d715dfd6d9b5db26
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_05_off00066ddc.bin rtf-objdata-decoded RTF \objdata at offset 0x66DDC 28731 bytes
SHA-256: 91a7ef7af4cfd8c294c48991e75d8d2501b278ea5ab1fe9e6494434b16ddf0bf
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008ee5e.bin rtf-objdata-decoded RTF \objdata at offset 0x8EE5E 28731 bytes
SHA-256: d4e6e87179b86b586b47d856fabb070dd9e6fdcdf69158f5292ab38fec88dbbc
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_08_off000a2e9f.bin rtf-objdata-decoded RTF \objdata at offset 0xA2E9F 28731 bytes
SHA-256: eb8fc52c8aa8c5da108d422d388e17a0dd5e76d188879a04996f567405f6ebdb
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_09_off000b6ee0.bin rtf-objdata-decoded RTF \objdata at offset 0xB6EE0 28731 bytes
SHA-256: f30fff56bca5173c2363d625ea3a247f89fd896e17ffc1141eb403e3dc56f878
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.