nymaim | 7a813978dfbb130aac54d2a785311931773a24cd7bddaaca4ba92791ae301f97

General

Target

file.exe
Size

1.7MB
MD5

6dfafc6c6d8881a9182960309f139e8d
SHA1

9ef77150f1c033057fc965c5a5d65963b2f49698
SHA256

7a813978dfbb130aac54d2a785311931773a24cd7bddaaca4ba92791ae301f97
SHA512

75053ba1f9b0398f7ffa1e00caf0ab15292361c0237fb4aee7821c8465ebec17edf179687dd9de91966014c2ba9a82923a3f3c7c4577de66c81c2cea24ff21ba
SSDEEP

49152:2p72WgflN9yqaOQ9TAOe/mBWUlycZxNeVio:2NzgflN9yqdCkPio

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
3616	is-BTI3G.tmp
4904	SplitFiles116.exe
4956	SJ2dem.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	SplitFiles116.exe

Loads dropped DLL 1 IoCs

pid	Process
3616	is-BTI3G.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-UMPE1.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\is-S1LA9.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\language\is-D6RP1.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\language\is-BS069.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\is-BG60A.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\is-LKVTP.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\is-F7DME.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\language\is-UEUF7.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\language\is-CJS5M.tmp	is-BTI3G.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles116.exe	is-BTI3G.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\is-P5IOL.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\language\is-P35C1.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\language\is-8BU2D.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\language\is-EMIJG.tmp	is-BTI3G.tmp
File created	C:\Program Files (x86)\Split Files\language\is-VTNLQ.tmp	is-BTI3G.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
4704	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4904	SplitFiles116.exe
4904	SplitFiles116.exe
4904	SplitFiles116.exe
4904	SplitFiles116.exe
4904	SplitFiles116.exe
4904	SplitFiles116.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4704	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4400 wrote to memory of 3616	4400	file.exe	81
PID 4400 wrote to memory of 3616	4400	file.exe	81
PID 4400 wrote to memory of 3616	4400	file.exe	81
PID 3616 wrote to memory of 4904	3616	is-BTI3G.tmp	82
PID 3616 wrote to memory of 4904	3616	is-BTI3G.tmp	82
PID 3616 wrote to memory of 4904	3616	is-BTI3G.tmp	82
PID 4904 wrote to memory of 4956	4904	SplitFiles116.exe	83
PID 4904 wrote to memory of 4956	4904	SplitFiles116.exe	83
PID 4904 wrote to memory of 4956	4904	SplitFiles116.exe	83
PID 4904 wrote to memory of 1700	4904	SplitFiles116.exe	91
PID 4904 wrote to memory of 1700	4904	SplitFiles116.exe	91
PID 4904 wrote to memory of 1700	4904	SplitFiles116.exe	91
PID 1700 wrote to memory of 4704	1700	cmd.exe	93
PID 1700 wrote to memory of 4704	1700	cmd.exe	93
PID 1700 wrote to memory of 4704	1700	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:4400
- C:\Users\Admin\AppData\Local\Temp\is-BNKR7.tmp\is-BTI3G.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-BNKR7.tmp\is-BTI3G.tmp" /SL4 $E01D6 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1551355 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3616
- - C:\Program Files (x86)\Split Files\SplitFiles116.exe
    "C:\Program Files (x86)\Split Files\SplitFiles116.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4904
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\SJ2dem.exe
      4⤵
      Executes dropped EXE
      PID:4956
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles116.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles116.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1700
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles116.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4704

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\SplitFiles116.exe

Filesize
3.0MB

MD5
0dc58ffcffe4c03475d9dd8b4e70cded

SHA1
95ff9ec8126d0f69591c3d105840bca00158b0ba

SHA256
9d5ccd4dd5459d5773958db08da6a4c39d5448999e668945f1cd010bc96b1460

SHA512
cfbaf02b24d88fcbf0b73d2994387c9ff6aa0d16362a1528260565064e0225790976255a7aaa2d0e73d3812986f49fdf3b46d625f9aef60c45cb736eb09fcbe0

Download Submit
C:\Program Files (x86)\Split Files\SplitFiles116.exe

Filesize
3.0MB

MD5
0dc58ffcffe4c03475d9dd8b4e70cded

SHA1
95ff9ec8126d0f69591c3d105840bca00158b0ba

SHA256
9d5ccd4dd5459d5773958db08da6a4c39d5448999e668945f1cd010bc96b1460

SHA512
cfbaf02b24d88fcbf0b73d2994387c9ff6aa0d16362a1528260565064e0225790976255a7aaa2d0e73d3812986f49fdf3b46d625f9aef60c45cb736eb09fcbe0

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-12I0L.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-BNKR7.tmp\is-BTI3G.tmp

Filesize
643KB

MD5
85b94e72c3f2d2b5464e2aaf3c9e242a

SHA1
ce7ccae5f50a990d059d59292d4a332979e162ba

SHA256
1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7

SHA512
c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-BNKR7.tmp\is-BTI3G.tmp

Filesize
643KB

MD5
85b94e72c3f2d2b5464e2aaf3c9e242a

SHA1
ce7ccae5f50a990d059d59292d4a332979e162ba

SHA256
1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7

SHA512
c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\SJ2dem.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\SJ2dem.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/4400-151-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/4400-132-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/4400-134-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/4400-156-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/4904-143-0x0000000000400000-0x000000000150C000-memory.dmp

Filesize
17.0MB

Download
memory/4904-142-0x0000000000400000-0x000000000150C000-memory.dmp

Filesize
17.0MB

Download
memory/4904-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/4904-152-0x0000000000400000-0x000000000150C000-memory.dmp

Filesize
17.0MB

Download
memory/4904-155-0x0000000000400000-0x000000000150C000-memory.dmp

Filesize
17.0MB

Download

Analysis

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