.
You can find the OEP by looking for the tail jump. Step over a few functions, and you will see a tail jump consisting of a jmp eax followed by many 0x00 bytes.
. The best strategy is to use a hardware breakpoint on the stack to find the OEP, as with ASPack. Petite uses a complicated code structure that makes it easy to spot the OEP once you have gotten close because the original code looks normal unlike the Petite wrapper code.
Petite also keeps at least one import from each library in the original import table. Although this does not affect how difficult it is to unpack, you can easily determine which DLLs the malware uses without unpacking it.
shows the tail jump for this executable., we showed that OllyDbg isn’t perfect and has issues parsing binaries that run just fine on Windows outside the debugger. If you encounter this problem, always try to use WinDbg before attempting to decipher PE header errors.Themida is a very complicated packer with many features. Most of the features are anti-debugging and anti-analysis, which make it a very secure packer that’s difficult to unpack and analyze.
Themida contains features that prevent analysis with VMware, debuggers, and Process Monitor (procmon). Themida also has a kernel component, which makes it much more difficult to analyze. Code running in the kernel has very few restrictions, and analysis code generally runs in user space, and is therefore subject to more restrictions.
Because Themida includes so many features, the packed executable is unusually bulky. In addition, unlike most packers, Themida’s code continues to run the entire time that the original program is running.
Some automated tools are designed to unpack Themida files, but their success varies based on the version of Themida and the settings used when the program was packed. Themida has so many features and settings that it is impossible to find a single unpacking strategy that will always work.
If automated tools don’t work, another great strategy is to use ProcDump to dump the process from memory without debugging. ProcDump is a tool from Microsoft for dumping the contents of a Windows process. It’s designed to work with a debugger, but is not itself a debugger. The biggest advantage of ProcDump is that you can dump process memory without stopping or debugging the process, which is extremely useful for packers that have advanced anti-debugging measures. Even when you cannot debug an executable, you can use ProcDump to dump the unpacked contents while the executable is running. This process doesn’t completely restore the original executable, but it does allow you to run strings and do some analysis on the code.
Themida is a very complicated packer with many features. Most of the features are anti-debugging and anti-analysis, which make it a very secure packer that’s difficult to unpack and analyze.
Themida contains features that prevent analysis with VMware, debuggers, and Process Monitor (procmon). Themida also has a kernel component, which makes it much more difficult to analyze. Code running in the kernel has very few restrictions, and analysis code generally runs in user space, and is therefore subject to more restrictions.
Because Themida includes so many features, the packed executable is unusually bulky. In addition, unlike most packers, Themida’s code continues to run the entire time that the original program is running.
Some automated tools are designed to unpack Themida files, but their success varies based on the version of Themida and the settings used when the program was packed. Themida has so many features and settings that it is impossible to find a single unpacking strategy that will always work.
If automated tools don’t work, another great strategy is to use ProcDump to dump the process from memory without debugging. ProcDump is a tool from Microsoft for dumping the contents of a Windows process. It’s designed to work with a debugger, but is not itself a debugger. The biggest advantage of ProcDump is that you can dump process memory without stopping or debugging the process, which is extremely useful for packers that have advanced anti-debugging measures. Even when you cannot debug an executable, you can use ProcDump to dump the unpacked contents while the executable is running. This process doesn’t completely restore the original executable, but it does allow you to run strings and do some analysis on the code.
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