root@et:~/hashcat# ./hashcat -m 16400 hash.txt -O -w 3 -a 3 ?a?a?a?a?a?a?a
hashcat (v4.0.1-90-gbb806d77) starting...

OpenCL Platform #1: NVIDIA Corporation
======================================
* Device #1: GeForce GTX 1080, 2026/8107 MB allocatable, 20MCU
* Device #2: GeForce GTX 1080, 2028/8114 MB allocatable, 20MCU
* Device #3: GeForce GTX 1080, 2028/8114 MB allocatable, 20MCU
* Device #4: GeForce GTX 1080, 2028/8114 MB allocatable, 20MCU

Hashes: 1 digests; 1 unique digests, 1 unique salts
Bitmaps: 16 bits, 65536 entries, 0x0000ffff mask, 262144 bytes, 5/13 rotates

Applicable optimizers:
* Optimized-Kernel
* Zero-Byte
* Precompute-Init
* Precompute-Merkle-Demgard
* Meet-In-The-Middle
* Early-Skip
* Not-Iterated
* Single-Hash
* Single-Salt
* Brute-Force
* Raw-Hash

Password length minimum: 0
Password length maximum: 55

Watchdog: Temperature abort trigger set to 90c

{CRAM-MD5}5389b33b9725e5657cb631dc50017ff1535ce4e2a1c414009126506fc4327d0d:hashcat

Session..........: hashcat
Status...........: Cracked
Hash.Type........: CRAM-MD5 Dovecot
Hash.Target......: {CRAM-MD5}5389b33b9725e5657cb631dc50017ff1535ce4e2a...327d0d
Time.Started.....: Fri Jan 19 10:23:04 2018 (28 secs)
Time.Estimated...: Fri Jan 19 10:23:32 2018 (0 secs)
Guess.Mask.......: ?a?a?a?a?a?a?a [7]
Guess.Queue......: 1/1 (100.00%)
Speed.Dev.#1.....: 21181.1 MH/s (31.28ms)
Speed.Dev.#2.....: 21171.4 MH/s (31.29ms)
Speed.Dev.#3.....: 21391.0 MH/s (30.96ms)
Speed.Dev.#4.....: 21234.2 MH/s (31.18ms)
Speed.Dev.#*.....: 84977.6 MH/s
Recovered........: 1/1 (100.00%) Digests, 1/1 (100.00%) Salts
Progress.........: 2353589125120/69833729609375 (3.37%)
Rejected.........: 0/2353589125120 (0.00%)
Restore.Point....: 655360/81450625 (0.80%)
Candidates.#1....: Okom$GU -> BdoXNPR
Candidates.#2....: 4{p*h_9 -> cyrg?86
Candidates.#3....: X"a1MYN -> R}KZ2((
Candidates.#4....: AHRFY?4 -> 2_r2#xe
HWMon.Dev.#1.....: Temp: 62c Fan: 39% Util:100% Core:1822MHz Mem:4513MHz Bus:1
HWMon.Dev.#2.....: Temp: 64c Fan: 41% Util:100% Core:1822MHz Mem:4513MHz Bus:1
HWMon.Dev.#3.....: Temp: 62c Fan: 40% Util:100% Core:1835MHz Mem:4513MHz Bus:1
HWMon.Dev.#4.....: Temp: 65c Fan: 41% Util:100% Core:1835MHz Mem:4513MHz Bus:1

Started: Fri Jan 19 10:22:59 2018
Stopped: Fri Jan 19 10:23:33 2018