nymaim | 98cc016f7aaa1b5ece9265b613a7dcd56458b56dbc0bf5b1a52946fbfe0d0ef8

General

Target

file.exe
Size

1.9MB
MD5

c0c1b07349e5627ac75c1a3acbbcc5dd
SHA1

1b252adaef3682657cc0473a4d5a5725c7fc8b11
SHA256

98cc016f7aaa1b5ece9265b613a7dcd56458b56dbc0bf5b1a52946fbfe0d0ef8
SHA512

fe4aa3b8af18add5927a2b7cafa24eb23546d88654f75cc8f8ebaa9279b1ba919c08aa8d5b4e138b1d49af78fc68a9996dde68512cee22b3387032f435796c5e
SSDEEP

49152:bihYNfRUZXavMO0Jovs4vDO9mu6PbsnXDMetVE8UkqB9:biIR26MaXv8muKoTMetVpqb

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
4848	is-G3BTP.tmp
3184	SplitFiles131.exe
4612	IT6wyTNwdDF4.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	SplitFiles131.exe

Loads dropped DLL 1 IoCs

pid	Process
4848	is-G3BTP.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-D582V.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\language\is-F67RI.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\is-PIUL9.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\is-JA8T5.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\language\is-N9G1F.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\language\is-P6TM9.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\language\is-36S2I.tmp	is-G3BTP.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\is-SHHP7.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\language\is-800HN.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\language\is-MC58O.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\language\is-FHJ55.tmp	is-G3BTP.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles131.exe	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\is-STC1L.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\language\is-228RA.tmp	is-G3BTP.tmp
File created	C:\Program Files (x86)\Split Files\is-GNMNL.tmp	is-G3BTP.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
3844	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3184	SplitFiles131.exe
3184	SplitFiles131.exe
3184	SplitFiles131.exe
3184	SplitFiles131.exe
3184	SplitFiles131.exe
3184	SplitFiles131.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3844	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4872 wrote to memory of 4848	4872	file.exe	80
PID 4872 wrote to memory of 4848	4872	file.exe	80
PID 4872 wrote to memory of 4848	4872	file.exe	80
PID 4848 wrote to memory of 3184	4848	is-G3BTP.tmp	81
PID 4848 wrote to memory of 3184	4848	is-G3BTP.tmp	81
PID 4848 wrote to memory of 3184	4848	is-G3BTP.tmp	81
PID 3184 wrote to memory of 4612	3184	SplitFiles131.exe	84
PID 3184 wrote to memory of 4612	3184	SplitFiles131.exe	84
PID 3184 wrote to memory of 4612	3184	SplitFiles131.exe	84
PID 3184 wrote to memory of 228	3184	SplitFiles131.exe	90
PID 3184 wrote to memory of 228	3184	SplitFiles131.exe	90
PID 3184 wrote to memory of 228	3184	SplitFiles131.exe	90
PID 228 wrote to memory of 3844	228	cmd.exe	92
PID 228 wrote to memory of 3844	228	cmd.exe	92
PID 228 wrote to memory of 3844	228	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:4872
- C:\Users\Admin\AppData\Local\Temp\is-MDQ5P.tmp\is-G3BTP.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-MDQ5P.tmp\is-G3BTP.tmp" /SL4 $801B8 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1692618 170496
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4848
- - C:\Program Files (x86)\Split Files\SplitFiles131.exe
    "C:\Program Files (x86)\Split Files\SplitFiles131.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:3184
  - - C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\IT6wyTNwdDF4.exe
      4⤵
      Executes dropped EXE
      PID:4612
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles131.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles131.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:228
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles131.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:3844

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\SplitFiles131.exe

Filesize
3.1MB

MD5
b882f2f35886b776b20b34453a777727

SHA1
52b12b4ce14b3ed1b34e6632116d8ed68bc68b20

SHA256
4dabb6bd5a9aa9a24ccfa60108e8cbd3a9a6356a2f58aeae55e4b1cf6a5c9798

SHA512
654c588880a16eed5d53673bbd425c3e1318e6792717d8e2ccbfbfb466928c6251d150c17a28c5842fda3668237c7ff9619f086d0d01ed428ed7d18207b7803f

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles131.exe

Filesize
3.1MB

MD5
b882f2f35886b776b20b34453a777727

SHA1
52b12b4ce14b3ed1b34e6632116d8ed68bc68b20

SHA256
4dabb6bd5a9aa9a24ccfa60108e8cbd3a9a6356a2f58aeae55e4b1cf6a5c9798

SHA512
654c588880a16eed5d53673bbd425c3e1318e6792717d8e2ccbfbfb466928c6251d150c17a28c5842fda3668237c7ff9619f086d0d01ed428ed7d18207b7803f

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-MDQ5P.tmp\is-G3BTP.tmp

Filesize
760KB

MD5
e8176050192fbb976d70238e3c121f4c

SHA1
2f1fd24efe1f3f3fee775cc3f5255b32f8880900

SHA256
ab4fe42a7b708ddb648bb2088216ff47b877ae599fd52ff50359fc1db8e11ef7

SHA512
27edf7a71c6546f1ab52e7ef97e404975ddd237d6c2d1038d24a49eab724971884510f00f427c713adb105857a0b12c7d57ca1ca1c70a6cefed4be619c345f4c

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-MDQ5P.tmp\is-G3BTP.tmp

Filesize
760KB

MD5
e8176050192fbb976d70238e3c121f4c

SHA1
2f1fd24efe1f3f3fee775cc3f5255b32f8880900

SHA256
ab4fe42a7b708ddb648bb2088216ff47b877ae599fd52ff50359fc1db8e11ef7

SHA512
27edf7a71c6546f1ab52e7ef97e404975ddd237d6c2d1038d24a49eab724971884510f00f427c713adb105857a0b12c7d57ca1ca1c70a6cefed4be619c345f4c

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-V1R00.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\IT6wyTNwdDF4.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\IT6wyTNwdDF4.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/3184-143-0x0000000000400000-0x0000000001526000-memory.dmp

Filesize
17.1MB

Download
memory/3184-142-0x0000000000400000-0x0000000001526000-memory.dmp

Filesize
17.1MB

Download
memory/3184-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/3184-152-0x0000000000400000-0x0000000001526000-memory.dmp

Filesize
17.1MB

Download
memory/3184-155-0x0000000000400000-0x0000000001526000-memory.dmp

Filesize
17.1MB

Download
memory/4872-132-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/4872-151-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/4872-134-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download
memory/4872-156-0x0000000000400000-0x0000000000430000-memory.dmp

Filesize
192KB

Download

Analysis

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