nymaim | 93191a2ceec8f02e01bb256eef4ffaf1c1d1a916de76f4e3788f1657b28efe81

Analysis

max time kernel
146s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
21/11/2022, 20:32

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General

Target
file.exe
Size 1.3MB
Sample221121-za94caaf8v
SHA256 93191a2ceec8f02e01bb256eef4ffaf1c1d1a916de76f4e3788f1657b28efe81
MD5 a3746bd0f62839530def1d4a70458118
SHA1 040584db070ef1511676890273d331bba0179e07
SHA512 67a92dfe054175f23f2836a43037a5adef69dc4054fca5427bd6e07adcd87fde06e294526093146ffe89e41e1d596ac6d14a83deb6afa273a6fca49d8064a34f
SSDEEP 24576:Nizndmx3+F/OrVPBkCfWgJwRahtYBFpb1h8tLlnviaduxDKbgZIY7eCLxYiR:mndi+F/tBgJxYBFpD8nFdSDNeViR
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
2392	is-01RS4.tmp
1660	PrintFolders.exe
3856	i3AiRRbuv.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	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
2392	is-01RS4.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-UFTSU.tmp	is-01RS4.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-01RS4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-CQ52J.tmp	is-01RS4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-O0PML.tmp	is-01RS4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MRUA8.tmp	is-01RS4.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-01RS4.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-01RS4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-R99FR.tmp	is-01RS4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-JSGOG.tmp	is-01RS4.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
4036	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1660	PrintFolders.exe
1660	PrintFolders.exe
1660	PrintFolders.exe
1660	PrintFolders.exe
1660	PrintFolders.exe
1660	PrintFolders.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1660	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4036	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1372 wrote to memory of 2392	1372	file.exe	85
PID 1372 wrote to memory of 2392	1372	file.exe	85
PID 1372 wrote to memory of 2392	1372	file.exe	85
PID 2392 wrote to memory of 1660	2392	is-01RS4.tmp	86
PID 2392 wrote to memory of 1660	2392	is-01RS4.tmp	86
PID 2392 wrote to memory of 1660	2392	is-01RS4.tmp	86
PID 1660 wrote to memory of 3856	1660	PrintFolders.exe	87
PID 1660 wrote to memory of 3856	1660	PrintFolders.exe	87
PID 1660 wrote to memory of 3856	1660	PrintFolders.exe	87
PID 1660 wrote to memory of 3796	1660	PrintFolders.exe	96
PID 1660 wrote to memory of 3796	1660	PrintFolders.exe	96
PID 1660 wrote to memory of 3796	1660	PrintFolders.exe	96
PID 3796 wrote to memory of 4036	3796	cmd.exe	98
PID 3796 wrote to memory of 4036	3796	cmd.exe	98
PID 3796 wrote to memory of 4036	3796	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1372
- C:\Users\Admin\AppData\Local\Temp\is-4ABGH.tmp\is-01RS4.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-4ABGH.tmp\is-01RS4.tmp" /SL4 $B01E0 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1110674 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2392
- - 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 behavior: GetForegroundWindowSpam
    - Suspicious use of WriteProcessMemory
    PID:1660
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\i3AiRRbuv.exe
      4⤵
      Executes dropped EXE
      PID:3856
  - - 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:3796
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4036

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 1.5MB
SHA256 2eee435740aec3ce108ea4964beead5b1f73fa1c6c301cbcc19d29c196840eb4
MD5 aa43ff53042c84b95cbe5e78aaf7b91a
SHA1 6de85e2992d5d5be3c682f7e6e07f02c25dd55f6
SHA512 03a943f7ddadd7aa535d3cab486f34690ab883b696136b4c988cc31e052ec32b64fc9bcd9bf58e11ba1c2cd9805be8f09c65865b506f57a6a11a38536d8a8ce0
SSDEEP 24576:R+yt+E+X++7+5+B+7O+WFQP28ZEwYvRfQEJwfOQE+maP/diJVIvoyQKxpj:Ayc9OrYQ7XWRm5YhQEqWaP/din0bj
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 1.5MB
SHA256 2eee435740aec3ce108ea4964beead5b1f73fa1c6c301cbcc19d29c196840eb4
MD5 aa43ff53042c84b95cbe5e78aaf7b91a
SHA1 6de85e2992d5d5be3c682f7e6e07f02c25dd55f6
SHA512 03a943f7ddadd7aa535d3cab486f34690ab883b696136b4c988cc31e052ec32b64fc9bcd9bf58e11ba1c2cd9805be8f09c65865b506f57a6a11a38536d8a8ce0
SSDEEP 24576:R+yt+E+X++7+5+B+7O+WFQP28ZEwYvRfQEJwfOQE+maP/diJVIvoyQKxpj:Ayc9OrYQ7XWRm5YhQEqWaP/din0bj
MD5 SHA1 SHA512 SSDEEP

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is-01RS4.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-4ABGH.tmp\is-01RS4.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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is-01RS4.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-4ABGH.tmp\is-01RS4.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-CQ42N.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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i3AiRRbuv.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\i3AiRRbuv.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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i3AiRRbuv.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\i3AiRRbuv.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/1372-138-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/1372-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/1372-157-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/1660-144-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/1660-145-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/1660-143-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/1660-149-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/1660-150-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/1660-156-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/1660-142-0x0000000000400000-0x000000000137F000-memory.dmp

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