nymaim | e8aacc014758fe6502f46e08a8e1abd3b5c1fdb4fa6f6c47596763dfd36fff8c

General

Target

file.exe
Size

2.1MB
MD5

50101e98e33d37f43dcef96003d56b36
SHA1

c2a192a084c4dfe97c675931869f79b5ce1f62d4
SHA256

e8aacc014758fe6502f46e08a8e1abd3b5c1fdb4fa6f6c47596763dfd36fff8c
SHA512

3ef75c14d84b26fbcd42f729503d65640a721c89af5c411d319e57321ad3df09b061ebc7b0b5912a844eac6316a52b368427875b31c154244f1035998f476539
SSDEEP

49152:2iAw7H/MQ5Uu89cyVR98cxMt4ktRDjLX/nvYX0FJx:2iAokKU1KyVQoM2ixjLvvYuJx

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
808	is-1U1D0.tmp
2280	SplitFiles129.exe
312	NMSu4P.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	SplitFiles129.exe

Loads dropped DLL 1 IoCs

pid	Process
808	is-1U1D0.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-PFE4K.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\is-TNV54.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\is-2VTNK.tmp	is-1U1D0.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-GIF7A.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-MGQUA.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-5NFCB.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-P63Q4.tmp	is-1U1D0.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles129.exe	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-5EJKO.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-KC98U.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\is-4ILBM.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-8MH28.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\is-SQ1C9.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\is-5R86A.tmp	is-1U1D0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-TSL4E.tmp	is-1U1D0.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
4984	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2280	SplitFiles129.exe
2280	SplitFiles129.exe
2280	SplitFiles129.exe
2280	SplitFiles129.exe
2280	SplitFiles129.exe
2280	SplitFiles129.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2280	SplitFiles129.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4984	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 844 wrote to memory of 808	844	file.exe	82
PID 844 wrote to memory of 808	844	file.exe	82
PID 844 wrote to memory of 808	844	file.exe	82
PID 808 wrote to memory of 2280	808	is-1U1D0.tmp	83
PID 808 wrote to memory of 2280	808	is-1U1D0.tmp	83
PID 808 wrote to memory of 2280	808	is-1U1D0.tmp	83
PID 2280 wrote to memory of 312	2280	SplitFiles129.exe	84
PID 2280 wrote to memory of 312	2280	SplitFiles129.exe	84
PID 2280 wrote to memory of 312	2280	SplitFiles129.exe	84
PID 2280 wrote to memory of 2256	2280	SplitFiles129.exe	92
PID 2280 wrote to memory of 2256	2280	SplitFiles129.exe	92
PID 2280 wrote to memory of 2256	2280	SplitFiles129.exe	92
PID 2256 wrote to memory of 4984	2256	cmd.exe	94
PID 2256 wrote to memory of 4984	2256	cmd.exe	94
PID 2256 wrote to memory of 4984	2256	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:844
- C:\Users\Admin\AppData\Local\Temp\is-C8KMN.tmp\is-1U1D0.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-C8KMN.tmp\is-1U1D0.tmp" /SL4 $B004C "C:\Users\Admin\AppData\Local\Temp\file.exe" 1894501 209408
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:808
- - C:\Program Files (x86)\Split Files\SplitFiles129.exe
    "C:\Program Files (x86)\Split Files\SplitFiles129.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of WriteProcessMemory
    PID:2280
  - - C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\NMSu4P.exe
      4⤵
      Executes dropped EXE
      PID:312
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles129.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles129.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2256
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles129.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4984

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\SplitFiles129.exe

Filesize
3.2MB

MD5
fb0e73488014b818b05e448f5adec9c6

SHA1
523d69850408da569c477aa799d340c5ceb5ab0d

SHA256
d87346fa74ef04c5220a724ffaf13e5c7428e5d5fd5374e36e916b9fd6384694

SHA512
b2e45b27a8c8f7a7b099440b4bfa5e8b83496edca1be8dba708d544792ab71286aa062ea779a6de24f010eaa7666e8c641d02b68bf5e582770d8e015daed46fa

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles129.exe

Filesize
3.2MB

MD5
fb0e73488014b818b05e448f5adec9c6

SHA1
523d69850408da569c477aa799d340c5ceb5ab0d

SHA256
d87346fa74ef04c5220a724ffaf13e5c7428e5d5fd5374e36e916b9fd6384694

SHA512
b2e45b27a8c8f7a7b099440b4bfa5e8b83496edca1be8dba708d544792ab71286aa062ea779a6de24f010eaa7666e8c641d02b68bf5e582770d8e015daed46fa

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-C8KMN.tmp\is-1U1D0.tmp

Filesize
798KB

MD5
8d84df7727d14b5e972c0af5b9baca1f

SHA1
37f37fad8bcbad5bc1c8c8e7154eefc9d9f30e65

SHA256
4143e0bcbc451f67a84e95656fb76f35742af5ca40a87cb92da32c282a2ccd6f

SHA512
7de2f690f344bb0a18e728284d2b431f5d44528efec4a015fbc822fe0258611bd9b32cdad8ffd56c6b15384bcff99b906544fe2d726edfa847a22eedbf16a6fe

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-C8KMN.tmp\is-1U1D0.tmp

Filesize
798KB

MD5
8d84df7727d14b5e972c0af5b9baca1f

SHA1
37f37fad8bcbad5bc1c8c8e7154eefc9d9f30e65

SHA256
4143e0bcbc451f67a84e95656fb76f35742af5ca40a87cb92da32c282a2ccd6f

SHA512
7de2f690f344bb0a18e728284d2b431f5d44528efec4a015fbc822fe0258611bd9b32cdad8ffd56c6b15384bcff99b906544fe2d726edfa847a22eedbf16a6fe

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-J4TGH.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}\NMSu4P.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\NMSu4P.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/312-145-0x0000000000000000-mapping.dmp

Download
memory/808-134-0x0000000000000000-mapping.dmp

Download
memory/844-156-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/844-132-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/844-138-0x0000000000400000-0x0000000000439000-memory.dmp

Filesize
228KB

Download
memory/2256-153-0x0000000000000000-mapping.dmp

Download
memory/2280-142-0x0000000000400000-0x0000000001540000-memory.dmp

Filesize
17.2MB

Download
memory/2280-144-0x0000000000400000-0x0000000001540000-memory.dmp

Filesize
17.2MB

Download
memory/2280-148-0x0000000000400000-0x0000000001540000-memory.dmp

Filesize
17.2MB

Download
memory/2280-149-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/2280-143-0x0000000000400000-0x0000000001540000-memory.dmp

Filesize
17.2MB

Download
memory/2280-155-0x0000000000400000-0x0000000001540000-memory.dmp

Filesize
17.2MB

Download
memory/2280-139-0x0000000000000000-mapping.dmp

Download
memory/4984-154-0x0000000000000000-mapping.dmp

Download

Analysis

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