nymaim | 27d10aec22ed5658c57e4bebc2c2b75a2fd219ff92602ab90b96fb44ce3a9e1b

Analysis

max time kernel
106s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
03/12/2022, 00:03

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General

Target
file.exe
Size 2.1MB
Sample221203-ab15dsbc6w
SHA256 27d10aec22ed5658c57e4bebc2c2b75a2fd219ff92602ab90b96fb44ce3a9e1b
MD5 c5c9531cdd0e882edd35f1df1d3d182e
SHA1 58c0fedcf8d0341f31dcd54193190c0b1cf143aa
SHA512 7fc94c4d3afcab181767a2c59c6e15afe22dea72d02d9874935712c451e84ce2df7525b2fb539fae78c322ab74dcc00c7231ddfe03c0cf7186d503d42d79af7d
SSDEEP 49152:AWCCb5nIMw0yjPtRNEUMPQucM3Y6hblgsCRi4AnIfAG5cyR:ArWeMzYPeUaND3BCsCRi4bfXcyR
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
1336	is-C4UVB.tmp
3676	PrintFolders.exe
312	w8VdIRqN.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
1336	is-C4UVB.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-G8RN1.tmp	is-C4UVB.tmp
File created	C:\Program Files (x86)\PrintFolders\is-AAGGJ.tmp	is-C4UVB.tmp
File created	C:\Program Files (x86)\PrintFolders\is-CIBIP.tmp	is-C4UVB.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-C4UVB.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-C4UVB.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-C4UVB.tmp
File created	C:\Program Files (x86)\PrintFolders\is-CP4EJ.tmp	is-C4UVB.tmp
File created	C:\Program Files (x86)\PrintFolders\is-88BRT.tmp	is-C4UVB.tmp
File created	C:\Program Files (x86)\PrintFolders\is-6LHA5.tmp	is-C4UVB.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
4528	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3676	PrintFolders.exe
3676	PrintFolders.exe
3676	PrintFolders.exe
3676	PrintFolders.exe
3676	PrintFolders.exe
3676	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4528	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2348 wrote to memory of 1336	2348	file.exe	82
PID 2348 wrote to memory of 1336	2348	file.exe	82
PID 2348 wrote to memory of 1336	2348	file.exe	82
PID 1336 wrote to memory of 3676	1336	is-C4UVB.tmp	83
PID 1336 wrote to memory of 3676	1336	is-C4UVB.tmp	83
PID 1336 wrote to memory of 3676	1336	is-C4UVB.tmp	83
PID 3676 wrote to memory of 312	3676	PrintFolders.exe	84
PID 3676 wrote to memory of 312	3676	PrintFolders.exe	84
PID 3676 wrote to memory of 312	3676	PrintFolders.exe	84
PID 3676 wrote to memory of 3532	3676	PrintFolders.exe	90
PID 3676 wrote to memory of 3532	3676	PrintFolders.exe	90
PID 3676 wrote to memory of 3532	3676	PrintFolders.exe	90
PID 3532 wrote to memory of 4528	3532	cmd.exe	92
PID 3532 wrote to memory of 4528	3532	cmd.exe	92
PID 3532 wrote to memory of 4528	3532	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2348
- C:\Users\Admin\AppData\Local\Temp\is-C3PNR.tmp\is-C4UVB.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-C3PNR.tmp\is-C4UVB.tmp" /SL4 $901C2 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2003209 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:1336
- - C:\Program Files (x86)\PrintFolders\PrintFolders.exe
    "C:\Program Files (x86)\PrintFolders\PrintFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:3676
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\w8VdIRqN.exe
      4⤵
      Executes dropped EXE
      PID:312
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "PrintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\PrintFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3532
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4528

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

Replay Monitor

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Downloads

PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.3MB
SHA256 075e8f7a11d08e452d29b6e05723c2883e8425c9602aa891022cd9fd0c6df7bb
MD5 9417f3fdcc2c4062b95fe4c5efbe476a
SHA1 2e0c4b139ea95a4f91a78ba51158d0e5e22b4db9
SHA512 b95584ea558f91feabb90a210da958994005b98f73e4ca006bf74c9c340b26d7af42a64b2244bfd003fff9fbc53c845595610f2cbf1f293d7c907eb24207b71f
SSDEEP 98304:vfD3bO9l0+Acu/2yJtJxsOKusDlpVB7vOVMzmB:vb3i0juZNB7GVMyB
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.3MB
SHA256 075e8f7a11d08e452d29b6e05723c2883e8425c9602aa891022cd9fd0c6df7bb
MD5 9417f3fdcc2c4062b95fe4c5efbe476a
SHA1 2e0c4b139ea95a4f91a78ba51158d0e5e22b4db9
SHA512 b95584ea558f91feabb90a210da958994005b98f73e4ca006bf74c9c340b26d7af42a64b2244bfd003fff9fbc53c845595610f2cbf1f293d7c907eb24207b71f
SSDEEP 98304:vfD3bO9l0+Acu/2yJtJxsOKusDlpVB7vOVMzmB:vb3i0juZNB7GVMyB
MD5 SHA1 SHA512 SSDEEP

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is-C4UVB.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-C3PNR.tmp\is-C4UVB.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-C4UVB.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-C3PNR.tmp\is-C4UVB.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-HCIP8.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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w8VdIRqN.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\w8VdIRqN.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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w8VdIRqN.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\w8VdIRqN.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/2348-156-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2348-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2348-137-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3676-143-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/3676-144-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/3676-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/3676-152-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/3676-142-0x0000000000400000-0x0000000001552000-memory.dmp

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memory/3676-155-0x0000000000400000-0x0000000001552000-memory.dmp

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