nymaim | 2e29a2b0ba3324044eefd04d83fbc574410f416df75a652f5f4967ccc0b5b0ce

Analysis

max time kernel
74s
max time network
137s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
11/12/2022, 12:16

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General

Target
file.exe
Size 2.5MB
Sample221211-pfgnwagh39
SHA256 2e29a2b0ba3324044eefd04d83fbc574410f416df75a652f5f4967ccc0b5b0ce
MD5 f7d0e8cad0aac1ba2e86041c8d23620b
SHA1 10ac19d0be4e727e4d7910b7c276b6aa7cff9c4d
SHA512 a9b0130aade2fe32ab360b90383a29b9c6330e7ed2f2d2324523790f4ce9de37aedeefde08a2fe6d4e739325a1aa698d975d2c69861547f2e8d4735a9cc5131d
SSDEEP 49152:N9OhxY+Jf3GbWSkispNN3QLdYi4On1cx1kUwzIwpOqQjb:N9x+xG/ki+NcdYtOnIudpv2
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

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
4912	is-RHKIK.tmp
4896	nvFolders.exe
3400	nkPYf3.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	nvFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4912	is-RHKIK.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 9 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\PrintFolders\is-36KI7.tmp	is-RHKIK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-QTPB8.tmp	is-RHKIK.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-RHKIK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-4S7HL.tmp	is-RHKIK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-AR5VV.tmp	is-RHKIK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-NDREP.tmp	is-RHKIK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-OI0T2.tmp	is-RHKIK.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-RHKIK.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\nvFolders.exe	is-RHKIK.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
716	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4896	nvFolders.exe
4896	nvFolders.exe
4896	nvFolders.exe
4896	nvFolders.exe
4896	nvFolders.exe
4896	nvFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	716	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3260 wrote to memory of 4912	3260	file.exe	79
PID 3260 wrote to memory of 4912	3260	file.exe	79
PID 3260 wrote to memory of 4912	3260	file.exe	79
PID 4912 wrote to memory of 4896	4912	is-RHKIK.tmp	80
PID 4912 wrote to memory of 4896	4912	is-RHKIK.tmp	80
PID 4912 wrote to memory of 4896	4912	is-RHKIK.tmp	80
PID 4896 wrote to memory of 3400	4896	nvFolders.exe	81
PID 4896 wrote to memory of 3400	4896	nvFolders.exe	81
PID 4896 wrote to memory of 3400	4896	nvFolders.exe	81
PID 4896 wrote to memory of 4696	4896	nvFolders.exe	89
PID 4896 wrote to memory of 4696	4896	nvFolders.exe	89
PID 4896 wrote to memory of 4696	4896	nvFolders.exe	89
PID 4696 wrote to memory of 716	4696	cmd.exe	91
PID 4696 wrote to memory of 716	4696	cmd.exe	91
PID 4696 wrote to memory of 716	4696	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3260
- C:\Users\Admin\AppData\Local\Temp\is-8R2VC.tmp\is-RHKIK.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-8R2VC.tmp\is-RHKIK.tmp" /SL4 $100052 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2310562 171520
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4912
- - C:\Program Files (x86)\PrintFolders\nvFolders.exe
    "C:\Program Files (x86)\PrintFolders\nvFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4896
  - - C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\nkPYf3.exe
      4⤵
      Executes dropped EXE
      PID:3400
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "nvFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nvFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4696
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "nvFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:716

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

nvFolders.exe

Path C:\Program Files (x86)\PrintFolders\nvFolders.exe
Size 3.6MB
SHA256 a452b20346a4f47815e9d7329d1ef90043e1568137eddb62dea517324e3c24f8
MD5 1ae39198b95a63c9dc335d899cb3a314
SHA1 914dd93d71950f9a4015e3e90c1e557b07839ac0
SHA512 f43dc0b5726d25881838292f44f5577bd3896f59c28146beb58ddfdb83276de340bfd06316be54263bf8b5b6aace4e5da8b10491c3034f8c5c12a338ff0c4814
SSDEEP 98304:5NHgp0v+kpTL1PB7elg6xPCCwYnpc8CzCdN:5YdH
MD5 SHA1 SHA512 SSDEEP

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nvFolders.exe

Path C:\Program Files (x86)\PrintFolders\nvFolders.exe
Size 3.6MB
SHA256 a452b20346a4f47815e9d7329d1ef90043e1568137eddb62dea517324e3c24f8
MD5 1ae39198b95a63c9dc335d899cb3a314
SHA1 914dd93d71950f9a4015e3e90c1e557b07839ac0
SHA512 f43dc0b5726d25881838292f44f5577bd3896f59c28146beb58ddfdb83276de340bfd06316be54263bf8b5b6aace4e5da8b10491c3034f8c5c12a338ff0c4814
SSDEEP 98304:5NHgp0v+kpTL1PB7elg6xPCCwYnpc8CzCdN:5YdH
MD5 SHA1 SHA512 SSDEEP

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is-RHKIK.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-8R2VC.tmp\is-RHKIK.tmp
Size 760KB
SHA256 b4ef6313468f57e2134646e25a50b41dd568938b4851fd63a42ffe3d9a3ab317
MD5 a322b20a784ea4c33e6c79160c56e0a6
SHA1 69b4788c3da60a5d4c3a6a2549c42b0953ad7086
SHA512 b219ad0ed9573f00df880b6747ce4c062d5e25904615e7f04d247c0703d2c405fa6e1906dd4bde91ea50bd926a801a48adcb591eb64e59c07ab0a9f8f85f4f64
SSDEEP 12288:gh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvRtq2xO0:y5NoqWolrP837JzHvA6yknyWFxvRt3xz
MD5 SHA1 SHA512 SSDEEP

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is-RHKIK.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-8R2VC.tmp\is-RHKIK.tmp
Size 760KB
SHA256 b4ef6313468f57e2134646e25a50b41dd568938b4851fd63a42ffe3d9a3ab317
MD5 a322b20a784ea4c33e6c79160c56e0a6
SHA1 69b4788c3da60a5d4c3a6a2549c42b0953ad7086
SHA512 b219ad0ed9573f00df880b6747ce4c062d5e25904615e7f04d247c0703d2c405fa6e1906dd4bde91ea50bd926a801a48adcb591eb64e59c07ab0a9f8f85f4f64
SSDEEP 12288:gh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvRtq2xO0:y5NoqWolrP837JzHvA6yknyWFxvRt3xz
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-G9F22.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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nkPYf3.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\nkPYf3.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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nkPYf3.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\nkPYf3.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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memory/3260-134-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/3260-157-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/3260-144-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/3260-132-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/4896-143-0x0000000000400000-0x00000000015A3000-memory.dmp

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memory/4896-145-0x0000000000400000-0x00000000015A3000-memory.dmp

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memory/4896-149-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4896-153-0x0000000000400000-0x00000000015A3000-memory.dmp

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memory/4896-155-0x0000000000400000-0x00000000015A3000-memory.dmp

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memory/4896-142-0x0000000000400000-0x00000000015A3000-memory.dmp

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