nymaim | 7dd134b5450749d4b8daa421e0f3596ec0070be90ba356d7403e813ec841a7ed

General

Target

file.exe
Size

1.8MB
MD5

6eea3379af1f90b861464f276070a8b8
SHA1

17a8a37d0d733791ca135ca5f8a33d20949356ee
SHA256

7dd134b5450749d4b8daa421e0f3596ec0070be90ba356d7403e813ec841a7ed
SHA512

54ba5191119591ba845d4fd26e014cb6aeca65a9555fd22a274a85045b346b0d738aae9ba2c3ffbc7833ae12f4593060262b4db3814fbfac8b858c004f502d2c
SSDEEP

49152:rbTgnyiIyyQ5rMw8o0ufaC7DUMP8f+nUj1tdWP7p3Q:rbAC8F8ts7jPnsdGdQ

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
1164	is-CNB3F.tmp
2200	SplitFiles117.exe
4560	8FFRNZ4alYyG.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-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	SplitFiles117.exe

Loads dropped DLL 1 IoCs

pid	Process
1164	is-CNB3F.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-TJBLD.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\language\is-3GE74.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\is-AR0GK.tmp	is-CNB3F.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles117.exe	is-CNB3F.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\language\is-1D20E.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\language\is-L7SRC.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\language\is-I9QFB.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\language\is-ENO93.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\language\is-SHJ0M.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\is-DUH29.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\is-F59VP.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\is-GO1V9.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\is-73HJQ.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\language\is-RCQV0.tmp	is-CNB3F.tmp
File created	C:\Program Files (x86)\Split Files\language\is-B83H4.tmp	is-CNB3F.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
2652	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2200	SplitFiles117.exe
2200	SplitFiles117.exe
2200	SplitFiles117.exe
2200	SplitFiles117.exe
2200	SplitFiles117.exe
2200	SplitFiles117.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2652	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2792 wrote to memory of 1164	2792	file.exe	81
PID 2792 wrote to memory of 1164	2792	file.exe	81
PID 2792 wrote to memory of 1164	2792	file.exe	81
PID 1164 wrote to memory of 2200	1164	is-CNB3F.tmp	82
PID 1164 wrote to memory of 2200	1164	is-CNB3F.tmp	82
PID 1164 wrote to memory of 2200	1164	is-CNB3F.tmp	82
PID 2200 wrote to memory of 4560	2200	SplitFiles117.exe	85
PID 2200 wrote to memory of 4560	2200	SplitFiles117.exe	85
PID 2200 wrote to memory of 4560	2200	SplitFiles117.exe	85
PID 2200 wrote to memory of 4060	2200	SplitFiles117.exe	91
PID 2200 wrote to memory of 4060	2200	SplitFiles117.exe	91
PID 2200 wrote to memory of 4060	2200	SplitFiles117.exe	91
PID 4060 wrote to memory of 2652	4060	cmd.exe	93
PID 4060 wrote to memory of 2652	4060	cmd.exe	93
PID 4060 wrote to memory of 2652	4060	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2792
- C:\Users\Admin\AppData\Local\Temp\is-1RBI0.tmp\is-CNB3F.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-1RBI0.tmp\is-CNB3F.tmp" /SL4 $D0062 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1601895 133120
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:1164
- - 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:2200
  - - C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\8FFRNZ4alYyG.exe
      4⤵
      Executes dropped EXE
      PID:4560
  - - 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:4060
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles117.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2652

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
3.2MB

MD5
510cfc0f5e61b1a98a07b0396270fcd4

SHA1
f78edcfdf3924364f6b3bed1d3459eac7e8459fe

SHA256
33d79772d09f1a510c7b2decfba3b7d7940652e4d6a04baaf44bc21127b51212

SHA512
d0f2e49d875020f444597b0a013740666513177591005bdc004f376d5be00c1eb224336f5d4a2a0504722784b50836d20b47d64699f1cdaa8153aa40f1ad7983

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

Filesize
3.2MB

MD5
510cfc0f5e61b1a98a07b0396270fcd4

SHA1
f78edcfdf3924364f6b3bed1d3459eac7e8459fe

SHA256
33d79772d09f1a510c7b2decfba3b7d7940652e4d6a04baaf44bc21127b51212

SHA512
d0f2e49d875020f444597b0a013740666513177591005bdc004f376d5be00c1eb224336f5d4a2a0504722784b50836d20b47d64699f1cdaa8153aa40f1ad7983

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-1RBI0.tmp\is-CNB3F.tmp

Filesize
723KB

MD5
7fd7ec3d32ed2a377fa18e8931475b2e

SHA1
30b386da1750701f78cbf65550f32661d8a4175f

SHA256
0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455

SHA512
db2ac34c30b89c2551d9e16de7d748e4a984141c889707a9edd165f328e75260ff6fb8d7383fb7c7fcf10000c08a10af03a50ce7b3665a8e935c0d5d66e59334

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-1RBI0.tmp\is-CNB3F.tmp

Filesize
723KB

MD5
7fd7ec3d32ed2a377fa18e8931475b2e

SHA1
30b386da1750701f78cbf65550f32661d8a4175f

SHA256
0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455

SHA512
db2ac34c30b89c2551d9e16de7d748e4a984141c889707a9edd165f328e75260ff6fb8d7383fb7c7fcf10000c08a10af03a50ce7b3665a8e935c0d5d66e59334

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-QD887.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\8FFRNZ4alYyG.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\8FFRNZ4alYyG.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/1164-134-0x0000000000000000-mapping.dmp

Download
memory/2200-142-0x0000000000400000-0x0000000001530000-memory.dmp

Filesize
17.2MB

Download
memory/2200-143-0x0000000000400000-0x0000000001530000-memory.dmp

Filesize
17.2MB

Download
memory/2200-144-0x0000000000400000-0x0000000001530000-memory.dmp

Filesize
17.2MB

Download
memory/2200-139-0x0000000000000000-mapping.dmp

Download
memory/2200-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/2200-152-0x0000000000400000-0x0000000001530000-memory.dmp

Filesize
17.2MB

Download
memory/2200-155-0x0000000000400000-0x0000000001530000-memory.dmp

Filesize
17.2MB

Download
memory/2652-154-0x0000000000000000-mapping.dmp

Download
memory/2792-132-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/2792-137-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/2792-156-0x0000000000400000-0x0000000000427000-memory.dmp

Filesize
156KB

Download
memory/4060-153-0x0000000000000000-mapping.dmp

Download
memory/4560-145-0x0000000000000000-mapping.dmp

Download

Analysis

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