nymaim | b14d9aa6555326ad929a388142716af4fc31a875d3b7db6456e08fe2478e6088

General

Target

file.exe
Size

1.8MB
MD5

071aebba968d25448940c3637bc8a091
SHA1

d7ab4e55e612643d041f0f76e2cd7ad41e42256d
SHA256

b14d9aa6555326ad929a388142716af4fc31a875d3b7db6456e08fe2478e6088
SHA512

6bae7bbdbd3c717ba3a38f38163633f23d62e5307b3e6fc9c0a720b69cd9db18d5ada6bd4009aece8d7b587d11c2e311ff290f3d58770b8228e2ae7621da237c
SSDEEP

24576:Spni2EWgo03X+B6Va614YXOs5n6C3clGoljRgT7ym8yZj9Jwf2ERHZlTp3H:QibvfY64YXl56C3kPljRgT7bJg2ENN3

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
1244	is-BCOIK.tmp
2548	SplitFiles124.exe
4436	ZvJY4ICPhQZ.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	SplitFiles124.exe

Loads dropped DLL 1 IoCs

pid	Process
1244	is-BCOIK.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 created	C:\Program Files (x86)\Split Files\language\is-4OLPK.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-KTED4.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-8UCEB.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\is-RV3GQ.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\is-TFF9Q.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-OU411.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\is-5V8PM.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\is-H5FQV.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-B94KU.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-PTHU9.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-068GL.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-M39TB.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-CKGFK.tmp	is-BCOIK.tmp
File created	C:\Program Files (x86)\Split Files\is-BTMRO.tmp	is-BCOIK.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-BCOIK.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles124.exe	is-BCOIK.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
5044	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2548	SplitFiles124.exe
2548	SplitFiles124.exe
2548	SplitFiles124.exe
2548	SplitFiles124.exe
2548	SplitFiles124.exe
2548	SplitFiles124.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	5044	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4756 wrote to memory of 1244	4756	file.exe	80
PID 4756 wrote to memory of 1244	4756	file.exe	80
PID 4756 wrote to memory of 1244	4756	file.exe	80
PID 1244 wrote to memory of 2548	1244	is-BCOIK.tmp	81
PID 1244 wrote to memory of 2548	1244	is-BCOIK.tmp	81
PID 1244 wrote to memory of 2548	1244	is-BCOIK.tmp	81
PID 2548 wrote to memory of 4436	2548	SplitFiles124.exe	82
PID 2548 wrote to memory of 4436	2548	SplitFiles124.exe	82
PID 2548 wrote to memory of 4436	2548	SplitFiles124.exe	82
PID 2548 wrote to memory of 3524	2548	SplitFiles124.exe	90
PID 2548 wrote to memory of 3524	2548	SplitFiles124.exe	90
PID 2548 wrote to memory of 3524	2548	SplitFiles124.exe	90
PID 3524 wrote to memory of 5044	3524	cmd.exe	92
PID 3524 wrote to memory of 5044	3524	cmd.exe	92
PID 3524 wrote to memory of 5044	3524	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4756
- C:\Users\Admin\AppData\Local\Temp\is-508AR.tmp\is-BCOIK.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-508AR.tmp\is-BCOIK.tmp" /SL4 $8005E "C:\Users\Admin\AppData\Local\Temp\file.exe" 1585254 96768
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:1244
- - C:\Program Files (x86)\Split Files\SplitFiles124.exe
    "C:\Program Files (x86)\Split Files\SplitFiles124.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:2548
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\ZvJY4ICPhQZ.exe
      4⤵
      Executes dropped EXE
      PID:4436
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles124.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles124.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3524
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles124.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:5044

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\SplitFiles124.exe

Filesize
3.1MB

MD5
206ee7107d5ccfea6acb7ba369b409da

SHA1
7618a41bf30e29d1fa076bc8154b296c4ddd212d

SHA256
9cfcb02f52aad03a9bfdd784873b6473554e22b526b43836fb146d0902f6939f

SHA512
9a2f897de98e282fac759ea8249aed8f39dd6d33aa7e5f94683c0088b1ce61e27d4f725fe2bb5b5f2684eeb76827ab5b3cce38dea3ca0981b5f2b7a928f81ec1

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles124.exe

Filesize
3.1MB

MD5
206ee7107d5ccfea6acb7ba369b409da

SHA1
7618a41bf30e29d1fa076bc8154b296c4ddd212d

SHA256
9cfcb02f52aad03a9bfdd784873b6473554e22b526b43836fb146d0902f6939f

SHA512
9a2f897de98e282fac759ea8249aed8f39dd6d33aa7e5f94683c0088b1ce61e27d4f725fe2bb5b5f2684eeb76827ab5b3cce38dea3ca0981b5f2b7a928f81ec1

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-508AR.tmp\is-BCOIK.tmp

Filesize
688KB

MD5
807603f3a565337ee2ac3e819b25ee58

SHA1
5cc4e6c82fbdda6697a1117561f23731d51baacd

SHA256
682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

SHA512
252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-508AR.tmp\is-BCOIK.tmp

Filesize
688KB

MD5
807603f3a565337ee2ac3e819b25ee58

SHA1
5cc4e6c82fbdda6697a1117561f23731d51baacd

SHA256
682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

SHA512
252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-RQD0K.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\ZvJY4ICPhQZ.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\ZvJY4ICPhQZ.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/2548-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/2548-142-0x0000000000400000-0x000000000151A000-memory.dmp

Filesize
17.1MB

Download
memory/2548-143-0x0000000000400000-0x000000000151A000-memory.dmp

Filesize
17.1MB

Download
memory/2548-144-0x0000000000400000-0x000000000151A000-memory.dmp

Filesize
17.1MB

Download
memory/2548-152-0x0000000000400000-0x000000000151A000-memory.dmp

Filesize
17.1MB

Download
memory/2548-155-0x0000000000400000-0x000000000151A000-memory.dmp

Filesize
17.1MB

Download
memory/4756-138-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4756-132-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4756-156-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download

Analysis

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