Malware
ostap
Ostap is a commodity JScript downloader first seen in campaigns in 2016.
Ostap is a commodity JScript downloader first seen in campaigns in 2016. It has been observed being delivered in ACE archives and VBA macro-enabled Microsoft Office documents. Recent versions of Ostap query WMI to check for a blacklist of running processes:
AgentSimulator.exe anti-virus.EXE BehaviorDumper BennyDB.exe ctfmon.exe fakepos_bin FrzState2k gemu-ga.exe (Possible misspelling of Qemu hypervisor’s guest agent, qemu-ga.exe) ImmunityDebugger.exe KMS Server Service.exe ProcessHacker procexp Proxifier.exe python tcpdump VBoxService VBoxTray.exe VmRemoteGuest vmtoolsd VMware2B.exe VzService.exe winace Wireshark
If a blacklisted process is found, the malware terminates.
Ostap has been observed delivering other malware families, including Nymaim, Backswap and TrickBot.
Family metadata imported from Malpedia (Fraunhofer FKIE).