nymaim | cf5b023a3d771e310d1fc855095c08f069c8161d37a63b1577391ad7c07dc3b2

General

Target

file.exe
Size

1.8MB
MD5

6eb562d13b2d1356d2dee940ec5adc3d
SHA1

fdef1c2caa5ff1a4d62fc371ee76e3ebb3f45611
SHA256

cf5b023a3d771e310d1fc855095c08f069c8161d37a63b1577391ad7c07dc3b2
SHA512

499c6ba4e837d2af8ec994a7d4304f7835659c198c49176be0b264bba2e9859c395e119253301e579681117a8381a7b260dc213c411c56d90d2d226951fcd251
SSDEEP

24576:RizigAhGmA9QbBREPulEWC1rHXydwgdKms698m0IT6QRdulHHHH5/+7NtYr6euJr:6iumgpPKDczXgQa8mfTUlHnH47/YrZaB

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
3132	is-LMK48.tmp
2376	SplitFiles119.exe
860	bZQe3z.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	SplitFiles119.exe

Loads dropped DLL 1 IoCs

pid	Process
3132	is-LMK48.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-S53UE.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\language\is-CQRT4.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\language\is-BDEPS.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\language\is-5PKQM.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\is-F867A.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\is-JID9G.tmp	is-LMK48.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles119.exe	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\is-CFO68.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\language\is-A06D5.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\is-VO98Q.tmp	is-LMK48.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\is-F9K4C.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\language\is-NFJFA.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\language\is-LGLKU.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\language\is-SN1IU.tmp	is-LMK48.tmp
File created	C:\Program Files (x86)\Split Files\language\is-DR3I9.tmp	is-LMK48.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
4496	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2376	SplitFiles119.exe
2376	SplitFiles119.exe
2376	SplitFiles119.exe
2376	SplitFiles119.exe
2376	SplitFiles119.exe
2376	SplitFiles119.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4496	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4856 wrote to memory of 3132	4856	file.exe	82
PID 4856 wrote to memory of 3132	4856	file.exe	82
PID 4856 wrote to memory of 3132	4856	file.exe	82
PID 3132 wrote to memory of 2376	3132	is-LMK48.tmp	83
PID 3132 wrote to memory of 2376	3132	is-LMK48.tmp	83
PID 3132 wrote to memory of 2376	3132	is-LMK48.tmp	83
PID 2376 wrote to memory of 860	2376	SplitFiles119.exe	85
PID 2376 wrote to memory of 860	2376	SplitFiles119.exe	85
PID 2376 wrote to memory of 860	2376	SplitFiles119.exe	85
PID 2376 wrote to memory of 4220	2376	SplitFiles119.exe	94
PID 2376 wrote to memory of 4220	2376	SplitFiles119.exe	94
PID 2376 wrote to memory of 4220	2376	SplitFiles119.exe	94
PID 4220 wrote to memory of 4496	4220	cmd.exe	96
PID 4220 wrote to memory of 4496	4220	cmd.exe	96
PID 4220 wrote to memory of 4496	4220	cmd.exe	96

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4856
- C:\Users\Admin\AppData\Local\Temp\is-IAV7D.tmp\is-LMK48.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-IAV7D.tmp\is-LMK48.tmp" /SL4 $C003E "C:\Users\Admin\AppData\Local\Temp\file.exe" 1610199 96256
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3132
- - C:\Program Files (x86)\Split Files\SplitFiles119.exe
    "C:\Program Files (x86)\Split Files\SplitFiles119.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:2376
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\bZQe3z.exe
      4⤵
      Executes dropped EXE
      PID:860
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles119.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles119.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4220
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles119.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4496

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\SplitFiles119.exe

Filesize
3.1MB

MD5
4a0276fd9e052d668ecf8b9bc4fa1fb9

SHA1
07bcd05c6e10cda1bfab048693b8d06a1a341751

SHA256
d7add9f45c145565ba45607bd0f4a6bb4b98a3f8d3a08cd1ebfd0d9c837e9de6

SHA512
4c8de7e4ad2c0a2c534bcdc4680287536f1625d4cd1f2749a4ce6376c1ca1a46920fa90bc4bebdd8ee6d7033ac887a3731ff1c75bd394a575ea53d264d32e8d4

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles119.exe

Filesize
3.1MB

MD5
4a0276fd9e052d668ecf8b9bc4fa1fb9

SHA1
07bcd05c6e10cda1bfab048693b8d06a1a341751

SHA256
d7add9f45c145565ba45607bd0f4a6bb4b98a3f8d3a08cd1ebfd0d9c837e9de6

SHA512
4c8de7e4ad2c0a2c534bcdc4680287536f1625d4cd1f2749a4ce6376c1ca1a46920fa90bc4bebdd8ee6d7033ac887a3731ff1c75bd394a575ea53d264d32e8d4

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-7RLL1.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-IAV7D.tmp\is-LMK48.tmp

Filesize
687KB

MD5
ec5433295f9c12c2ac5bad1a56aa05b6

SHA1
ec15e0b4f070b25a2b074c235f0d6ec0b2778000

SHA256
a726a8996bdfca72a14eed5af6c7136bd195fb6c214326c5345d7ab1f08b4f84

SHA512
c866bdd9173f2a9efb2ed515ec0fa0f597d29e28c853c37dea5e94c059ec009c32ef430ae002ceff44920a847037f1dee5b45c8e99bbed121227f41c4d3f3737

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-IAV7D.tmp\is-LMK48.tmp

Filesize
687KB

MD5
ec5433295f9c12c2ac5bad1a56aa05b6

SHA1
ec15e0b4f070b25a2b074c235f0d6ec0b2778000

SHA256
a726a8996bdfca72a14eed5af6c7136bd195fb6c214326c5345d7ab1f08b4f84

SHA512
c866bdd9173f2a9efb2ed515ec0fa0f597d29e28c853c37dea5e94c059ec009c32ef430ae002ceff44920a847037f1dee5b45c8e99bbed121227f41c4d3f3737

Download Submit
C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\bZQe3z.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\bZQe3z.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/860-144-0x0000000000000000-mapping.dmp

Download
memory/2376-143-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/2376-142-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/2376-139-0x0000000000000000-mapping.dmp

Download
memory/2376-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/2376-152-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/2376-155-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/3132-135-0x0000000000000000-mapping.dmp

Download
memory/4220-153-0x0000000000000000-mapping.dmp

Download
memory/4496-154-0x0000000000000000-mapping.dmp

Download
memory/4856-132-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4856-134-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4856-151-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/4856-156-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download

Analysis

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