nymaim | ce4ac721e112c8cd58f042b9d371d641597b4dffd91d402c5372df8fc1fc60ee

Analysis

max time kernel
91s
max time network
154s
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, 04:03

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General

Target
file.exe
Size 3.5MB
Sample221203-emcndscg96
SHA256 ce4ac721e112c8cd58f042b9d371d641597b4dffd91d402c5372df8fc1fc60ee
MD5 8109a7e15349d328aae3c3b248a11b56
SHA1 840bd56dc257e32ea17c887624a9b9a743d461bd
SHA512 d45633ca01eab100df309f171ac6bf3ebe75380b8e34ab22e5a577e8d422f00dae93d519e0004d549a76d0f06b9fc6e425de7dd140cd9b1290730566705ff164
SSDEEP 49152:weVUpJp5chvoINUtTFSHGELj3k47lTTv4a3XSSy/7DjwWyK1GYZjA8UsbIs6OLAE:wRpJp52voINEb6Y4BT8AidbX1AOXcyn
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
4900	is-0IBP8.tmp
2668	PrintFolders.exe
3284	feTxdXf.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
4900	is-0IBP8.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-M7HK6.tmp	is-0IBP8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-1OO7C.tmp	is-0IBP8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-HDDPK.tmp	is-0IBP8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-O88G2.tmp	is-0IBP8.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-0IBP8.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-0IBP8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-JJ08G.tmp	is-0IBP8.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-0IBP8.tmp
File created	C:\Program Files (x86)\PrintFolders\is-IFBM6.tmp	is-0IBP8.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
4932	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2668	PrintFolders.exe
2668	PrintFolders.exe
2668	PrintFolders.exe
2668	PrintFolders.exe
2668	PrintFolders.exe
2668	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4932	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2692 wrote to memory of 4900	2692	file.exe	81
PID 2692 wrote to memory of 4900	2692	file.exe	81
PID 2692 wrote to memory of 4900	2692	file.exe	81
PID 4900 wrote to memory of 2668	4900	is-0IBP8.tmp	82
PID 4900 wrote to memory of 2668	4900	is-0IBP8.tmp	82
PID 4900 wrote to memory of 2668	4900	is-0IBP8.tmp	82
PID 2668 wrote to memory of 3284	2668	PrintFolders.exe	83
PID 2668 wrote to memory of 3284	2668	PrintFolders.exe	83
PID 2668 wrote to memory of 3284	2668	PrintFolders.exe	83
PID 2668 wrote to memory of 2056	2668	PrintFolders.exe	90
PID 2668 wrote to memory of 2056	2668	PrintFolders.exe	90
PID 2668 wrote to memory of 2056	2668	PrintFolders.exe	90
PID 2056 wrote to memory of 4932	2056	cmd.exe	92
PID 2056 wrote to memory of 4932	2056	cmd.exe	92
PID 2056 wrote to memory of 4932	2056	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:2692
- C:\Users\Admin\AppData\Local\Temp\is-T6EC8.tmp\is-0IBP8.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-T6EC8.tmp\is-0IBP8.tmp" /SL4 $90060 "C:\Users\Admin\AppData\Local\Temp\file.exe" 3390372 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4900
- - 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:2668
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\feTxdXf.exe
      4⤵
      Executes dropped EXE
      PID:3284
  - - 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:2056
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4932

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 5.7MB
SHA256 d26122ed523b624558a0e0826439d3c74ab8a216e208a176cfa55d2900d53cc6
MD5 d9cdc76eba74ae2aeb3284db0658fa7a
SHA1 270ce865e273efd0b2bb995e02046a5590835030
SHA512 663b7d42dbe9792b17c3c1d8873480c7a5cfb0017dcaa240950851bf4b15f1072e477d10c3541a2f995aca76627bbb9006513af5619e3386ca77139eb2189b9a
SSDEEP 49152:hR35AFjp8ytqDqQ2e+H+OjXpniybkSlssujgQWLgmbqOhAi692ELY8duhAOz8IRm:h+jd75PniyBESnWOhisELY8duGW8IUsS
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 5.7MB
SHA256 d26122ed523b624558a0e0826439d3c74ab8a216e208a176cfa55d2900d53cc6
MD5 d9cdc76eba74ae2aeb3284db0658fa7a
SHA1 270ce865e273efd0b2bb995e02046a5590835030
SHA512 663b7d42dbe9792b17c3c1d8873480c7a5cfb0017dcaa240950851bf4b15f1072e477d10c3541a2f995aca76627bbb9006513af5619e3386ca77139eb2189b9a
SSDEEP 49152:hR35AFjp8ytqDqQ2e+H+OjXpniybkSlssujgQWLgmbqOhAi692ELY8duhAOz8IRm:h+jd75PniyBESnWOhisELY8duGW8IUsS
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-36R5R.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-0IBP8.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-T6EC8.tmp\is-0IBP8.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-0IBP8.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-T6EC8.tmp\is-0IBP8.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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feTxdXf.exe

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

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\feTxdXf.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/2668-143-0x0000000000400000-0x00000000017BD000-memory.dmp

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memory/2668-142-0x0000000000400000-0x00000000017BD000-memory.dmp

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memory/2668-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/2668-151-0x0000000000400000-0x00000000017BD000-memory.dmp

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memory/2668-154-0x0000000000400000-0x00000000017BD000-memory.dmp

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memory/2692-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2692-137-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2692-155-0x0000000000400000-0x0000000000413000-memory.dmp

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