nymaim | 891a96d92189de25f4d9505c3b4d4f0bf952b084df7c380083ade6f7a59dde7b

Analysis

max time kernel
183s
max time network
193s
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, 08:32

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General

Target
file.exe
Size 2.3MB
Sample221211-kfa4wabd31
SHA256 891a96d92189de25f4d9505c3b4d4f0bf952b084df7c380083ade6f7a59dde7b
MD5 d0f03447286bb434d95300701805c527
SHA1 8cab105d0c7e2a747a0c16427ec0192b49a2e74d
SHA512 f6f6de00f4a86e9e42178c7143c49e92a9a5f36632e5c25df817f2b81c1175b1a36c6128be207701754b6d82cff600038cf48ca4f559745d97c428ffb3a594d9
SSDEEP 49152:JVU3wflglH8hF0+Rz0sO3sVdInJCWqEF9eCqdxujC5ydlb7Bt9qQjU:JV6wf6H8hC+RzgmdInJFFoCqd0x7It
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
4192	is-EF2EI.tmp
3988	nvFolders.exe
2236	8fGammN0.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	nvFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4192	is-EF2EI.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-VR0NC.tmp	is-EF2EI.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\nvFolders.exe	is-EF2EI.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-EF2EI.tmp
File created	C:\Program Files (x86)\PrintFolders\is-H66U6.tmp	is-EF2EI.tmp
File created	C:\Program Files (x86)\PrintFolders\is-N1LRQ.tmp	is-EF2EI.tmp
File created	C:\Program Files (x86)\PrintFolders\is-QP199.tmp	is-EF2EI.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-EF2EI.tmp
File created	C:\Program Files (x86)\PrintFolders\is-QNU3Q.tmp	is-EF2EI.tmp
File created	C:\Program Files (x86)\PrintFolders\is-O3DVI.tmp	is-EF2EI.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
2484	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3988	nvFolders.exe
3988	nvFolders.exe
3988	nvFolders.exe
3988	nvFolders.exe
3988	nvFolders.exe
3988	nvFolders.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3988	nvFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2484	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4636 wrote to memory of 4192	4636	file.exe	80
PID 4636 wrote to memory of 4192	4636	file.exe	80
PID 4636 wrote to memory of 4192	4636	file.exe	80
PID 4192 wrote to memory of 3988	4192	is-EF2EI.tmp	81
PID 4192 wrote to memory of 3988	4192	is-EF2EI.tmp	81
PID 4192 wrote to memory of 3988	4192	is-EF2EI.tmp	81
PID 3988 wrote to memory of 2236	3988	nvFolders.exe	82
PID 3988 wrote to memory of 2236	3988	nvFolders.exe	82
PID 3988 wrote to memory of 2236	3988	nvFolders.exe	82
PID 3988 wrote to memory of 3264	3988	nvFolders.exe	83
PID 3988 wrote to memory of 3264	3988	nvFolders.exe	83
PID 3988 wrote to memory of 3264	3988	nvFolders.exe	83
PID 3264 wrote to memory of 2484	3264	cmd.exe	85
PID 3264 wrote to memory of 2484	3264	cmd.exe	85
PID 3264 wrote to memory of 2484	3264	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4636
- C:\Users\Admin\AppData\Local\Temp\is-HGT04.tmp\is-EF2EI.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-HGT04.tmp\is-EF2EI.tmp" /SL4 $901C0 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2117709 171520
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4192
- - 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 behavior: GetForegroundWindowSpam
    - Suspicious use of WriteProcessMemory
    PID:3988
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\8fGammN0.exe
      4⤵
      Executes dropped EXE
      PID:2236
  - - 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:3264
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "nvFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:2484

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 3.4MB
SHA256 23ccbccb2570acfbb0016255e604f2159264ede9532845aaf5fa129d0274eb52
MD5 9d30cfec60f2e61bda42885005af0cd3
SHA1 754e73cb307345f990bf4b42f4e7c5b7a05c62ca
SHA512 84c6785733ef865abd409d56154fb1b910648590d26dfb0b249ce5c35f4a94cb04fdd6092dd75d58b032491516fb1620c258da14fb0f69a29f653dba9313915b
SSDEEP 98304:HEiHqLnQXvAqTn2GRSNG0wEQLjivCAXd41V:pL1J
MD5 SHA1 SHA512 SSDEEP

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nvFolders.exe

Path C:\Program Files (x86)\PrintFolders\nvFolders.exe
Size 3.4MB
SHA256 23ccbccb2570acfbb0016255e604f2159264ede9532845aaf5fa129d0274eb52
MD5 9d30cfec60f2e61bda42885005af0cd3
SHA1 754e73cb307345f990bf4b42f4e7c5b7a05c62ca
SHA512 84c6785733ef865abd409d56154fb1b910648590d26dfb0b249ce5c35f4a94cb04fdd6092dd75d58b032491516fb1620c258da14fb0f69a29f653dba9313915b
SSDEEP 98304:HEiHqLnQXvAqTn2GRSNG0wEQLjivCAXd41V:pL1J
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-7NM5P.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-EF2EI.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-HGT04.tmp\is-EF2EI.tmp
Size 760KB
SHA256 b4ef6313468f57e2134646e25a50b41dd568938b4851fd63a42ffe3d9a3ab317
MD5 a322b20a784ea4c33e6c79160c56e0a6
SHA1 69b4788c3da60a5d4c3a6a2549c42b0953ad7086
SHA512 b219ad0ed9573f00df880b6747ce4c062d5e25904615e7f04d247c0703d2c405fa6e1906dd4bde91ea50bd926a801a48adcb591eb64e59c07ab0a9f8f85f4f64
SSDEEP 12288:gh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvRtq2xO0:y5NoqWolrP837JzHvA6yknyWFxvRt3xz
MD5 SHA1 SHA512 SSDEEP

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is-EF2EI.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-HGT04.tmp\is-EF2EI.tmp
Size 760KB
SHA256 b4ef6313468f57e2134646e25a50b41dd568938b4851fd63a42ffe3d9a3ab317
MD5 a322b20a784ea4c33e6c79160c56e0a6
SHA1 69b4788c3da60a5d4c3a6a2549c42b0953ad7086
SHA512 b219ad0ed9573f00df880b6747ce4c062d5e25904615e7f04d247c0703d2c405fa6e1906dd4bde91ea50bd926a801a48adcb591eb64e59c07ab0a9f8f85f4f64
SSDEEP 12288:gh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvRtq2xO0:y5NoqWolrP837JzHvA6yknyWFxvRt3xz
MD5 SHA1 SHA512 SSDEEP

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8fGammN0.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\8fGammN0.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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8fGammN0.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\8fGammN0.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/3988-143-0x0000000000400000-0x0000000001571000-memory.dmp

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memory/3988-144-0x0000000000400000-0x0000000001571000-memory.dmp

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memory/3988-142-0x0000000000400000-0x0000000001571000-memory.dmp

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memory/3988-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/3988-152-0x0000000000400000-0x0000000001571000-memory.dmp

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memory/3988-155-0x0000000000400000-0x0000000001571000-memory.dmp

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memory/4636-132-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/4636-137-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/4636-156-0x0000000000400000-0x0000000000430000-memory.dmp

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