Simple decryptor for strings found in MOLE ransomware sample

whakmoles.py

"""
Simple decryptor for strings found in MOLE ransomware sample

MD5: d87cebeb7298e8669079ed3b4f203fd7

"""

def decrypt_string(ctext):

    out = ""
    for c in ctext:
        v3 = ord(c)
        if v3 < 0x61 or v3 > 0x7a:
            if v3 < 65 or v3 > 0x5a:
                out += chr(v3)
            else:
                out += chr((v3 - 52) % 26 + 65)
        else:
            out += chr((v3 - 84) % 26 + 0x61)

    return out

print decrypt_string("fhccbegkktorsq7p.bavba")
print decrypt_string("fhccbegwl2kiiqzk.bavba")
print decrypt_string("/P opqrqvg /frg {qrsnhyg} obbgfgnghfcbyvpl vtabernyysnvyh")
print decrypt_string("/P opqrqvg /frg {qrsnhyg} erpbirelranoyrq Ab")
print decrypt_string("/P iffnqzva.rkr Qryrgr Funqbjf /Nyy /Dhvrg")