Created
October 31, 2019 14:03
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Decode strings in Ghidra from sample 11864ec73e6226f52a1e6e4074b33e89
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| from ghidra.program.model.listing import CodeUnit | |
| decrypt_func = 0x004039a0 | |
| def decode(offset): | |
| count = 0 | |
| res = b'' | |
| b = getByte(toAddr(offset)) | |
| while b != 0x0: | |
| try: | |
| if b == 0x20: | |
| res += ' ' | |
| elif count & 3 == 0: | |
| res += chr(b - 0x3) | |
| else: | |
| res += chr(b + 0x4) | |
| except ValueError: | |
| pass | |
| count += 2 | |
| b = getByte(toAddr(offset+count)) | |
| return res | |
| def seek_back(inst): | |
| while True: | |
| prev = getInstructionBefore(inst) | |
| #print "Searching %s" % prev.toString() | |
| if "PUSH" in prev.toString(): | |
| break | |
| inst = prev | |
| return prev | |
| refs = getReferencesTo(toAddr(decrypt_func)) | |
| for r in refs: | |
| callee = r.getFromAddress() | |
| inst = getInstructionAt(callee) | |
| push_instr = seek_back(inst) | |
| #push_instr = getInstructionBefore(inst) | |
| if "PUSH" in push_instr.toString(): | |
| offset = push_instr.toString().split(' ')[-1] | |
| comment = decode(int(offset,16)) | |
| print 'Adding comment %s to %s' % (comment, inst.getAddress()) | |
| cu = currentProgram.getListing().getCodeUnitAt(inst.getAddress()) | |
| cu.setComment(CodeUnit.PRE_COMMENT, comment) |
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