nymaim | ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894

General

Target

ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894.exe
Size

1.9MB
MD5

44f7a89471f95dad419f2b31158ddc01
SHA1

8f0d0de6d3a3185fa6b9ffddec389937048d1785
SHA256

ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894
SHA512

e5f63aad0f765fec7de2c21de9933209eb8845d01231529988a6659332dbfdb152daf2dc434d684aa572397d265ed8a0e5829a703634f08a7862bd4b1c52f1e2
SSDEEP

49152:bz+sg//TQ/t5FTZuUIBeSwVip/dZXgWP7p39:bz+3/U/Pp1IBbwVil7gGd9

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
4904	is-058TC.tmp
4324	SplitFiles117.exe
2896	ThhbacY3lCUK4.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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	SplitFiles117.exe

Loads dropped DLL 1 IoCs

pid	Process
4904	is-058TC.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-UG8SF.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\language\is-LB605.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\is-D8CJ3.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\is-D76G1.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\is-4E23N.tmp	is-058TC.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles117.exe	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\is-IDMEP.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\language\is-3O543.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\language\is-4510B.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\language\is-M0N1E.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\language\is-M262J.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\language\is-SBL43.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\language\is-SBH9E.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\is-FBGQ9.tmp	is-058TC.tmp
File created	C:\Program Files (x86)\Split Files\language\is-6TAU1.tmp	is-058TC.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-058TC.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
776	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4324	SplitFiles117.exe
4324	SplitFiles117.exe
4324	SplitFiles117.exe
4324	SplitFiles117.exe
4324	SplitFiles117.exe
4324	SplitFiles117.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	776	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4644 wrote to memory of 4904	4644	ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894.exe	82
PID 4644 wrote to memory of 4904	4644	ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894.exe	82
PID 4644 wrote to memory of 4904	4644	ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894.exe	82
PID 4904 wrote to memory of 4324	4904	is-058TC.tmp	83
PID 4904 wrote to memory of 4324	4904	is-058TC.tmp	83
PID 4904 wrote to memory of 4324	4904	is-058TC.tmp	83
PID 4324 wrote to memory of 2896	4324	SplitFiles117.exe	84
PID 4324 wrote to memory of 2896	4324	SplitFiles117.exe	84
PID 4324 wrote to memory of 2896	4324	SplitFiles117.exe	84
PID 4324 wrote to memory of 4980	4324	SplitFiles117.exe	92
PID 4324 wrote to memory of 4980	4324	SplitFiles117.exe	92
PID 4324 wrote to memory of 4980	4324	SplitFiles117.exe	92
PID 4980 wrote to memory of 776	4980	cmd.exe	94
PID 4980 wrote to memory of 776	4980	cmd.exe	94
PID 4980 wrote to memory of 776	4980	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894.exe
"C:\Users\Admin\AppData\Local\Temp\ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4644
- C:\Users\Admin\AppData\Local\Temp\is-V5NOB.tmp\is-058TC.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-V5NOB.tmp\is-058TC.tmp" /SL4 $701D8 "C:\Users\Admin\AppData\Local\Temp\ab678f799b50d07b551d3ab5573ec4c57e3ebf4d8ca00e50b00fa5d79307f894.exe" 1784531 133120
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4904
- - C:\Program Files (x86)\Split Files\SplitFiles117.exe
    "C:\Program Files (x86)\Split Files\SplitFiles117.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4324
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\ThhbacY3lCUK4.exe
      4⤵
      Executes dropped EXE
      PID:2896
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles117.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles117.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4980
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles117.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:776

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\SplitFiles117.exe

Filesize
3.4MB

MD5
0d5b58bc6f96b9d8f4583546377497dc

SHA1
79df0d0fc6328d07a7692a5cd6b6f116505bbc5e

SHA256
7f89809f248a227c09618d5147e4c572d51a87e5c2631de27e49d31e87b49c2a

SHA512
58d0f99860c7c4101fec1f5eb336b1647c5eb140b0d0dca21f842a81f9723738f0999cd5c23e0ad7f9c17de0673e862ff2c529879740ca3e0225a8390451ad91

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles117.exe

Filesize
3.4MB

MD5
0d5b58bc6f96b9d8f4583546377497dc

SHA1
79df0d0fc6328d07a7692a5cd6b6f116505bbc5e

SHA256
7f89809f248a227c09618d5147e4c572d51a87e5c2631de27e49d31e87b49c2a

SHA512
58d0f99860c7c4101fec1f5eb336b1647c5eb140b0d0dca21f842a81f9723738f0999cd5c23e0ad7f9c17de0673e862ff2c529879740ca3e0225a8390451ad91

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-6PKAA.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-V5NOB.tmp\is-058TC.tmp

Filesize
723KB

MD5
7fd7ec3d32ed2a377fa18e8931475b2e

SHA1
30b386da1750701f78cbf65550f32661d8a4175f

SHA256
0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455

SHA512
db2ac34c30b89c2551d9e16de7d748e4a984141c889707a9edd165f328e75260ff6fb8d7383fb7c7fcf10000c08a10af03a50ce7b3665a8e935c0d5d66e59334

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-V5NOB.tmp\is-058TC.tmp

Filesize
723KB

MD5
7fd7ec3d32ed2a377fa18e8931475b2e

SHA1
30b386da1750701f78cbf65550f32661d8a4175f

SHA256
0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455

SHA512
db2ac34c30b89c2551d9e16de7d748e4a984141c889707a9edd165f328e75260ff6fb8d7383fb7c7fcf10000c08a10af03a50ce7b3665a8e935c0d5d66e59334

Download Submit
C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\ThhbacY3lCUK4.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\ThhbacY3lCUK4.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

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

Filesize
108KB

Download
memory/4324-142-0x0000000000400000-0x0000000001562000-memory.dmp

Filesize
17.4MB

Download
memory/4324-144-0x0000000000400000-0x0000000001562000-memory.dmp

Filesize
17.4MB

Download
memory/4324-143-0x0000000000400000-0x0000000001562000-memory.dmp

Filesize
17.4MB

Download
memory/4324-152-0x0000000000400000-0x0000000001562000-memory.dmp

Filesize
17.4MB

Download
memory/4324-155-0x0000000000400000-0x0000000001562000-memory.dmp

Filesize
17.4MB

Download
memory/4644-138-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/4644-132-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/4644-156-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download

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