nymaim | 5fe42f0673e04cb007c0a0d27f91cde8f27fce6010265af64ad0cc3ec12ac9ca

General

Target

file.exe
Size

1.9MB
MD5

f33d5113c8da65888ec19a56b73e3ebd
SHA1

90ef4d7173178045a259edc5ab18ba3bade06bf4
SHA256

5fe42f0673e04cb007c0a0d27f91cde8f27fce6010265af64ad0cc3ec12ac9ca
SHA512

e4e94934f76eb09eb7a2d10e3f1bb874dcec3aa213196e1620c68dbfc17fde737f5e1536eb979afed36c519bd960bc947add7b8f5ec0518db4608ceef7d79705
SSDEEP

49152:uicyVoG/C5PdxGG45U30eq7W4C41zVLsvAtBhK74xIW8pZa0:uicycJG775y2V8ApBKM0

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

C2

45.139.105.171

85.31.46.167

Signatures

NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
trojan nymaim

Executes dropped EXE 3 IoCs

pid	Process
2632	is-7F06C.tmp
640	SplitFiles119.exe
2132	1PoZCywRRui.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	SplitFiles119.exe

Loads dropped DLL 1 IoCs

pid	Process
2632	is-7F06C.tmp

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in Program Files directory 17 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-7F06C.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles119.exe	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-LBENC.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-3BTF3.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\is-STIAU.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\is-KQ7EG.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\is-0MII2.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\is-0RC88.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-4SD4C.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-JHISK.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-6T7BK.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-KV8DI.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-QFG4F.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-G6B28.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\language\is-J7VFG.tmp	is-7F06C.tmp
File created	C:\Program Files (x86)\Split Files\is-BDOIA.tmp	is-7F06C.tmp

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
4436	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
640	SplitFiles119.exe
640	SplitFiles119.exe
640	SplitFiles119.exe
640	SplitFiles119.exe
640	SplitFiles119.exe
640	SplitFiles119.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4436	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4032 wrote to memory of 2632	4032	file.exe	82
PID 4032 wrote to memory of 2632	4032	file.exe	82
PID 4032 wrote to memory of 2632	4032	file.exe	82
PID 2632 wrote to memory of 640	2632	is-7F06C.tmp	83
PID 2632 wrote to memory of 640	2632	is-7F06C.tmp	83
PID 2632 wrote to memory of 640	2632	is-7F06C.tmp	83
PID 640 wrote to memory of 2132	640	SplitFiles119.exe	84
PID 640 wrote to memory of 2132	640	SplitFiles119.exe	84
PID 640 wrote to memory of 2132	640	SplitFiles119.exe	84
PID 640 wrote to memory of 2212	640	SplitFiles119.exe	92
PID 640 wrote to memory of 2212	640	SplitFiles119.exe	92
PID 640 wrote to memory of 2212	640	SplitFiles119.exe	92
PID 2212 wrote to memory of 4436	2212	cmd.exe	94
PID 2212 wrote to memory of 4436	2212	cmd.exe	94
PID 2212 wrote to memory of 4436	2212	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4032
- C:\Users\Admin\AppData\Local\Temp\is-FBFFE.tmp\is-7F06C.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-FBFFE.tmp\is-7F06C.tmp" /SL4 $80066 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1760071 96256
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2632
- - C:\Program Files (x86)\Split Files\SplitFiles119.exe
    "C:\Program Files (x86)\Split Files\SplitFiles119.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:640
  - - C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\1PoZCywRRui.exe
      4⤵
      Executes dropped EXE
      PID:2132
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles119.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles119.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2212
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles119.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4436

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\Split Files\SplitFiles119.exe

Filesize
3.3MB

MD5
5f3af6977baf0970503b8da4f3f48dc9

SHA1
a138b4d4d8ef0f0d7dfaa333dd5f9d6f21d3f84d

SHA256
49c28ccb47a05a0d67f2f6a35c4c6cea43894233b50b32f095097cf66e768912

SHA512
587375f7d5bfb6cc21dd266f42114dd38492ccf6a0c4976ec9e91e351d093b18f5985ab90bc6e0a004d1802be4144983b1b4bf444d5d3a226741e8febe3069e1

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles119.exe

Filesize
3.3MB

MD5
5f3af6977baf0970503b8da4f3f48dc9

SHA1
a138b4d4d8ef0f0d7dfaa333dd5f9d6f21d3f84d

SHA256
49c28ccb47a05a0d67f2f6a35c4c6cea43894233b50b32f095097cf66e768912

SHA512
587375f7d5bfb6cc21dd266f42114dd38492ccf6a0c4976ec9e91e351d093b18f5985ab90bc6e0a004d1802be4144983b1b4bf444d5d3a226741e8febe3069e1

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-38M4M.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-FBFFE.tmp\is-7F06C.tmp

Filesize
687KB

MD5
ec5433295f9c12c2ac5bad1a56aa05b6

SHA1
ec15e0b4f070b25a2b074c235f0d6ec0b2778000

SHA256
a726a8996bdfca72a14eed5af6c7136bd195fb6c214326c5345d7ab1f08b4f84

SHA512
c866bdd9173f2a9efb2ed515ec0fa0f597d29e28c853c37dea5e94c059ec009c32ef430ae002ceff44920a847037f1dee5b45c8e99bbed121227f41c4d3f3737

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-FBFFE.tmp\is-7F06C.tmp

Filesize
687KB

MD5
ec5433295f9c12c2ac5bad1a56aa05b6

SHA1
ec15e0b4f070b25a2b074c235f0d6ec0b2778000

SHA256
a726a8996bdfca72a14eed5af6c7136bd195fb6c214326c5345d7ab1f08b4f84

SHA512
c866bdd9173f2a9efb2ed515ec0fa0f597d29e28c853c37dea5e94c059ec009c32ef430ae002ceff44920a847037f1dee5b45c8e99bbed121227f41c4d3f3737

Download Submit
C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\1PoZCywRRui.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\1PoZCywRRui.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/640-142-0x0000000000400000-0x0000000001544000-memory.dmp

Filesize
17.3MB

Download
memory/640-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/640-143-0x0000000000400000-0x0000000001544000-memory.dmp

Filesize
17.3MB

Download
memory/640-155-0x0000000000400000-0x0000000001544000-memory.dmp

Filesize
17.3MB

Download
memory/640-144-0x0000000000400000-0x0000000001544000-memory.dmp

Filesize
17.3MB

Download
memory/640-139-0x0000000000000000-mapping.dmp

Download
memory/640-152-0x0000000000400000-0x0000000001544000-memory.dmp

Filesize
17.3MB

Download
memory/2132-145-0x0000000000000000-mapping.dmp

Download
memory/2212-153-0x0000000000000000-mapping.dmp

Download
memory/2632-134-0x0000000000000000-mapping.dmp

Download
memory/4032-137-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4032-132-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4032-156-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4436-154-0x0000000000000000-mapping.dmp

Download

Analysis

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