nymaim | eb461b2c0b780141c9c1419e24e5d69627f653eb8bbf4e35f581244e6a280cf5

General

Target

file.exe
Size

1.7MB
MD5

b59b28ff51451b466d70f9ac6e7cb586
SHA1

afc7e90ed2622e85245a301e65415e2d70ef85d4
SHA256

eb461b2c0b780141c9c1419e24e5d69627f653eb8bbf4e35f581244e6a280cf5
SHA512

4b68f35472065fd99290fe313190d5a51311587481c26462092da94698b01f070ebeb632dabf5512f2598698e351338286b660d6a238b06e2ea0bd98c97ccc8e
SSDEEP

49152:Wi0IReKwV7R6TuP0Lf2W+C/nQwE53k8iZaw:WiNsKwV7R0uP0LfnFQNU7Mw

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
5008	is-53RQK.tmp
4904	SplitFiles120.exe
768	ZAyfQ.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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	SplitFiles120.exe

Loads dropped DLL 1 IoCs

pid	Process
5008	is-53RQK.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\unins000.dat	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-B4EU9.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-2ST98.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-KMKP5.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\is-H8HJS.tmp	is-53RQK.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-53RQK.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles120.exe	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-LJ4LK.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-PRP2H.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-7TQ59.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\is-ESJLF.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\is-QT02G.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-HUANG.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\is-HO54A.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-Q7BJK.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\language\is-4QNT0.tmp	is-53RQK.tmp
File created	C:\Program Files (x86)\Split Files\is-5M3A0.tmp	is-53RQK.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
1636	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4904	SplitFiles120.exe
4904	SplitFiles120.exe
4904	SplitFiles120.exe
4904	SplitFiles120.exe
4904	SplitFiles120.exe
4904	SplitFiles120.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1636	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 704 wrote to memory of 5008	704	file.exe	81
PID 704 wrote to memory of 5008	704	file.exe	81
PID 704 wrote to memory of 5008	704	file.exe	81
PID 5008 wrote to memory of 4904	5008	is-53RQK.tmp	82
PID 5008 wrote to memory of 4904	5008	is-53RQK.tmp	82
PID 5008 wrote to memory of 4904	5008	is-53RQK.tmp	82
PID 4904 wrote to memory of 768	4904	SplitFiles120.exe	83
PID 4904 wrote to memory of 768	4904	SplitFiles120.exe	83
PID 4904 wrote to memory of 768	4904	SplitFiles120.exe	83
PID 4904 wrote to memory of 1504	4904	SplitFiles120.exe	91
PID 4904 wrote to memory of 1504	4904	SplitFiles120.exe	91
PID 4904 wrote to memory of 1504	4904	SplitFiles120.exe	91
PID 1504 wrote to memory of 1636	1504	cmd.exe	93
PID 1504 wrote to memory of 1636	1504	cmd.exe	93
PID 1504 wrote to memory of 1636	1504	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:704
- C:\Users\Admin\AppData\Local\Temp\is-LBSPM.tmp\is-53RQK.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-LBSPM.tmp\is-53RQK.tmp" /SL4 $80062 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1554977 96256
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:5008
- - C:\Program Files (x86)\Split Files\SplitFiles120.exe
    "C:\Program Files (x86)\Split Files\SplitFiles120.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4904
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\ZAyfQ.exe
      4⤵
      Executes dropped EXE
      PID:768
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles120.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles120.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1504
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles120.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1636

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\SplitFiles120.exe

Filesize
3.1MB

MD5
6cc3a35505d70c6e19ddda4d936184b8

SHA1
e6cf61a88eb467508d1806be940c48b956e39e4e

SHA256
62e293e5256b2b9c13ae2fb6d5d6fe287ec56fbf2635066f77f159b83aa44e48

SHA512
537f5336a18bbb98b00cc4649e65eeac68a1e44f663307750f69f26cff7e36157d6d6b629a91638d657be169441f40f5f7a0e2750ae23fd3784a56b457de6d78

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles120.exe

Filesize
3.1MB

MD5
6cc3a35505d70c6e19ddda4d936184b8

SHA1
e6cf61a88eb467508d1806be940c48b956e39e4e

SHA256
62e293e5256b2b9c13ae2fb6d5d6fe287ec56fbf2635066f77f159b83aa44e48

SHA512
537f5336a18bbb98b00cc4649e65eeac68a1e44f663307750f69f26cff7e36157d6d6b629a91638d657be169441f40f5f7a0e2750ae23fd3784a56b457de6d78

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-D65NN.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-LBSPM.tmp\is-53RQK.tmp

Filesize
687KB

MD5
ec5433295f9c12c2ac5bad1a56aa05b6

SHA1
ec15e0b4f070b25a2b074c235f0d6ec0b2778000

SHA256
a726a8996bdfca72a14eed5af6c7136bd195fb6c214326c5345d7ab1f08b4f84

SHA512
c866bdd9173f2a9efb2ed515ec0fa0f597d29e28c853c37dea5e94c059ec009c32ef430ae002ceff44920a847037f1dee5b45c8e99bbed121227f41c4d3f3737

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-LBSPM.tmp\is-53RQK.tmp

Filesize
687KB

MD5
ec5433295f9c12c2ac5bad1a56aa05b6

SHA1
ec15e0b4f070b25a2b074c235f0d6ec0b2778000

SHA256
a726a8996bdfca72a14eed5af6c7136bd195fb6c214326c5345d7ab1f08b4f84

SHA512
c866bdd9173f2a9efb2ed515ec0fa0f597d29e28c853c37dea5e94c059ec009c32ef430ae002ceff44920a847037f1dee5b45c8e99bbed121227f41c4d3f3737

Download Submit
C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\ZAyfQ.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\ZAyfQ.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/704-134-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/704-157-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/704-132-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/704-152-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4904-143-0x0000000000400000-0x0000000001511000-memory.dmp

Filesize
17.1MB

Download
memory/4904-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4904-144-0x0000000000400000-0x0000000001511000-memory.dmp

Filesize
17.1MB

Download
memory/4904-153-0x0000000000400000-0x0000000001511000-memory.dmp

Filesize
17.1MB

Download
memory/4904-142-0x0000000000400000-0x0000000001511000-memory.dmp

Filesize
17.1MB

Download
memory/4904-156-0x0000000000400000-0x0000000001511000-memory.dmp

Filesize
17.1MB

Download

Analysis

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