nymaim | ec6b19d04f4cb95cfd8f9d59b548531335829619d24531baec8e086d6f848a38

General

Target

b54b41d8e1dec9884acb3da21ffeb8353a8acb8a53a4c30efa27c139a9ef0a92.exe
Size

1.8MB
MD5

0e5ddc4a80ccdb5d621cf855403a0f82
SHA1

0d98053a54f7a1d3a263d0e9668e446973209ac7
SHA256

b54b41d8e1dec9884acb3da21ffeb8353a8acb8a53a4c30efa27c139a9ef0a92
SHA512

7896e08df48984674b93bbeb005cb386da511bb91f42466ce5fd8cf86866ee4414dd08e7d8045cbb530229d821d6f240012ae82b4ff63e0acddeaa32f6017271
SSDEEP

49152:Bi9/6KenaLi+VsncnUvPjlK+9J8RIX444+Hth96j:BiN6Kej6sPvPJZOh44+HtHu

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
4172	is-2VBGH.tmp
4324	SplitFiles124.exe
4672	uvdwj.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
4172	is-2VBGH.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-7FVQ9.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-KHBJ4.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-OJ4TA.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\is-U6P47.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\is-SL9E9.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-79DBD.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\is-3TJOB.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-5CMDS.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-63539.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\is-D2519.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\is-E4BRV.tmp	is-2VBGH.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-2VBGH.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles124.exe	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-018E2.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-KKFFH.tmp	is-2VBGH.tmp
File created	C:\Program Files (x86)\Split Files\language\is-GAA86.tmp	is-2VBGH.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
2824	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4324	SplitFiles124.exe
4324	SplitFiles124.exe
4324	SplitFiles124.exe
4324	SplitFiles124.exe
4324	SplitFiles124.exe
4324	SplitFiles124.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2824	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 5100 wrote to memory of 4172	5100	b54b41d8e1dec9884acb3da21ffeb8353a8acb8a53a4c30efa27c139a9ef0a92.exe	80
PID 5100 wrote to memory of 4172	5100	b54b41d8e1dec9884acb3da21ffeb8353a8acb8a53a4c30efa27c139a9ef0a92.exe	80
PID 5100 wrote to memory of 4172	5100	b54b41d8e1dec9884acb3da21ffeb8353a8acb8a53a4c30efa27c139a9ef0a92.exe	80
PID 4172 wrote to memory of 4324	4172	is-2VBGH.tmp	81
PID 4172 wrote to memory of 4324	4172	is-2VBGH.tmp	81
PID 4172 wrote to memory of 4324	4172	is-2VBGH.tmp	81
PID 4324 wrote to memory of 4672	4324	SplitFiles124.exe	82
PID 4324 wrote to memory of 4672	4324	SplitFiles124.exe	82
PID 4324 wrote to memory of 4672	4324	SplitFiles124.exe	82
PID 4324 wrote to memory of 3880	4324	SplitFiles124.exe	90
PID 4324 wrote to memory of 3880	4324	SplitFiles124.exe	90
PID 4324 wrote to memory of 3880	4324	SplitFiles124.exe	90
PID 3880 wrote to memory of 2824	3880	cmd.exe	92
PID 3880 wrote to memory of 2824	3880	cmd.exe	92
PID 3880 wrote to memory of 2824	3880	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\b54b41d8e1dec9884acb3da21ffeb8353a8acb8a53a4c30efa27c139a9ef0a92.exe
"C:\Users\Admin\AppData\Local\Temp\b54b41d8e1dec9884acb3da21ffeb8353a8acb8a53a4c30efa27c139a9ef0a92.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:5100
- C:\Users\Admin\AppData\Local\Temp\is-L7NLL.tmp\is-2VBGH.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-L7NLL.tmp\is-2VBGH.tmp" /SL4 $90028 "C:\Users\Admin\AppData\Local\Temp\b54b41d8e1dec9884acb3da21ffeb8353a8acb8a53a4c30efa27c139a9ef0a92.exe" 1657362 166400
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4172
- - 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:4324
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\uvdwj.exe
      4⤵
      Executes dropped EXE
      PID:4672
  - - 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:3880
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles124.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2824

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

Loading Replay Monitor...

Downloads

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

Filesize
3.2MB

MD5
f2141645fdf3b561736673fca8055c61

SHA1
70a769f62a283efac05015d190eb47f40daa1f23

SHA256
90ddbb189f6fa34906b1aa486261db282ea4f71fd50d28d58b314f16b5135ec1

SHA512
0a581262fd111ae1afa2e21b2c461fd29b02545fd53a1e4f156b9f42b6b88fc62aa3a805f0da2432240d0026404b5c765efdd051309ee243a11fb911b41dff02

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

Filesize
3.2MB

MD5
f2141645fdf3b561736673fca8055c61

SHA1
70a769f62a283efac05015d190eb47f40daa1f23

SHA256
90ddbb189f6fa34906b1aa486261db282ea4f71fd50d28d58b314f16b5135ec1

SHA512
0a581262fd111ae1afa2e21b2c461fd29b02545fd53a1e4f156b9f42b6b88fc62aa3a805f0da2432240d0026404b5c765efdd051309ee243a11fb911b41dff02

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-L7NLL.tmp\is-2VBGH.tmp

Filesize
756KB

MD5
88c7387a76635a30298c1fea18eb963d

SHA1
8a01e609d9f076fd09ec9eec99b512c3571efdbc

SHA256
0cf25da416c0de0814b116f3b917412415e285622149b82d6ee701d94316427b

SHA512
e3d7736fa09f81ff239ce20b9c7cfacc171b63a215f5658c0de9f57dfbb4b9fb7dd96875ecacd7e652d06ff100fa4f7fca63ba2688d48b122bf03c8dbd08ad2b

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-L7NLL.tmp\is-2VBGH.tmp

Filesize
756KB

MD5
88c7387a76635a30298c1fea18eb963d

SHA1
8a01e609d9f076fd09ec9eec99b512c3571efdbc

SHA256
0cf25da416c0de0814b116f3b917412415e285622149b82d6ee701d94316427b

SHA512
e3d7736fa09f81ff239ce20b9c7cfacc171b63a215f5658c0de9f57dfbb4b9fb7dd96875ecacd7e652d06ff100fa4f7fca63ba2688d48b122bf03c8dbd08ad2b

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-TNG7R.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}\uvdwj.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

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

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/4324-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4324-144-0x0000000000400000-0x000000000152C000-memory.dmp

Filesize
17.2MB

Download
memory/4324-143-0x0000000000400000-0x000000000152C000-memory.dmp

Filesize
17.2MB

Download
memory/4324-142-0x0000000000400000-0x000000000152C000-memory.dmp

Filesize
17.2MB

Download
memory/4324-152-0x0000000000400000-0x000000000152C000-memory.dmp

Filesize
17.2MB

Download
memory/4324-155-0x0000000000400000-0x000000000152C000-memory.dmp

Filesize
17.2MB

Download
memory/5100-132-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/5100-138-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/5100-156-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download

Analysis

Sharing