nymaim | b2f330125f6a09ebd5eaa88e5dcc582a34de1f3fb6997d1299180d678532b8a5

General

Target

file.exe
Size

1.7MB
MD5

99838b7b07ad40e555b779128b2b512c
SHA1

81549fe5c484886e3265b1c09c27df29bbad7484
SHA256

b2f330125f6a09ebd5eaa88e5dcc582a34de1f3fb6997d1299180d678532b8a5
SHA512

c06562a1861dedb05e9f2226fd974f180520ccb02d535f365763d146251f2f0d8237f1e9fe36d4fb693e35dbeeb3e89c83301d1cd27b67dc459e8ec2cb2861f9
SSDEEP

49152:yiFXjLacmNJqXzfEsLSejK61els8CeFZaR:yiFzLacmNU4YSeHL8vFMR

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
4280	is-BUDD0.tmp
628	SplitFiles119.exe
4316	Gaym6G5T9o.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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	SplitFiles119.exe

Loads dropped DLL 1 IoCs

pid	Process
4280	is-BUDD0.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\is-0A5QD.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-VDLQS.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-NGO05.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-FJG9L.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\is-OODGT.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-19CA9.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\is-AISG1.tmp	is-BUDD0.tmp
File opened for modification	C:\Program Files (x86)\Split Files\unins000.dat	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\unins000.dat	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-1A4HD.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\is-O235L.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\is-DK9R2.tmp	is-BUDD0.tmp
File opened for modification	C:\Program Files (x86)\Split Files\SplitFiles119.exe	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-ILQK3.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-9RAN6.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-8L7CI.tmp	is-BUDD0.tmp
File created	C:\Program Files (x86)\Split Files\language\is-NPQ2M.tmp	is-BUDD0.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
4696	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
628	SplitFiles119.exe
628	SplitFiles119.exe
628	SplitFiles119.exe
628	SplitFiles119.exe
628	SplitFiles119.exe
628	SplitFiles119.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4696	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3804 wrote to memory of 4280	3804	file.exe	81
PID 3804 wrote to memory of 4280	3804	file.exe	81
PID 3804 wrote to memory of 4280	3804	file.exe	81
PID 4280 wrote to memory of 628	4280	is-BUDD0.tmp	82
PID 4280 wrote to memory of 628	4280	is-BUDD0.tmp	82
PID 4280 wrote to memory of 628	4280	is-BUDD0.tmp	82
PID 628 wrote to memory of 4316	628	SplitFiles119.exe	86
PID 628 wrote to memory of 4316	628	SplitFiles119.exe	86
PID 628 wrote to memory of 4316	628	SplitFiles119.exe	86
PID 628 wrote to memory of 1136	628	SplitFiles119.exe	91
PID 628 wrote to memory of 1136	628	SplitFiles119.exe	91
PID 628 wrote to memory of 1136	628	SplitFiles119.exe	91
PID 1136 wrote to memory of 4696	1136	cmd.exe	93
PID 1136 wrote to memory of 4696	1136	cmd.exe	93
PID 1136 wrote to memory of 4696	1136	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:3804
- C:\Users\Admin\AppData\Local\Temp\is-V00BQ.tmp\is-BUDD0.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-V00BQ.tmp\is-BUDD0.tmp" /SL4 $80064 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1583201 96256
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4280
- - 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:628
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\Gaym6G5T9o.exe
      4⤵
      Executes dropped EXE
      PID:4316
  - - 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:1136
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "SplitFiles119.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4696

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
a8d4130dc39f7bf2e7c126c2148e0042

SHA1
d4e32f5863796d8edf96d5366727e9e16ceeae48

SHA256
fb81b6436bb26172e0dc3550d2f13e9bce4b8e42fb9c8b318369f01cf39d796e

SHA512
eba8b8cd2d92142293184c0a3d16cc47f8b50e6efb6a99b593449a3fe8deb9a93708a2a5469006a6c77d90170799f13e94dab60e9ad61d313fd53d92ca759448

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

Filesize
3.1MB

MD5
a8d4130dc39f7bf2e7c126c2148e0042

SHA1
d4e32f5863796d8edf96d5366727e9e16ceeae48

SHA256
fb81b6436bb26172e0dc3550d2f13e9bce4b8e42fb9c8b318369f01cf39d796e

SHA512
eba8b8cd2d92142293184c0a3d16cc47f8b50e6efb6a99b593449a3fe8deb9a93708a2a5469006a6c77d90170799f13e94dab60e9ad61d313fd53d92ca759448

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-7K161.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-V00BQ.tmp\is-BUDD0.tmp

Filesize
687KB

MD5
ec5433295f9c12c2ac5bad1a56aa05b6

SHA1
ec15e0b4f070b25a2b074c235f0d6ec0b2778000

SHA256
a726a8996bdfca72a14eed5af6c7136bd195fb6c214326c5345d7ab1f08b4f84

SHA512
c866bdd9173f2a9efb2ed515ec0fa0f597d29e28c853c37dea5e94c059ec009c32ef430ae002ceff44920a847037f1dee5b45c8e99bbed121227f41c4d3f3737

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-V00BQ.tmp\is-BUDD0.tmp

Filesize
687KB

MD5
ec5433295f9c12c2ac5bad1a56aa05b6

SHA1
ec15e0b4f070b25a2b074c235f0d6ec0b2778000

SHA256
a726a8996bdfca72a14eed5af6c7136bd195fb6c214326c5345d7ab1f08b4f84

SHA512
c866bdd9173f2a9efb2ed515ec0fa0f597d29e28c853c37dea5e94c059ec009c32ef430ae002ceff44920a847037f1dee5b45c8e99bbed121227f41c4d3f3737

Download Submit
C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\Gaym6G5T9o.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\Gaym6G5T9o.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/628-143-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/628-148-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/628-142-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/628-155-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/628-144-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/628-152-0x0000000000400000-0x0000000001512000-memory.dmp

Filesize
17.1MB

Download
memory/3804-137-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/3804-132-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/3804-156-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download

Analysis

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