nymaim | 5f7d5ac5776d86b03306916e6a5bbba4ff53a8fa302ee520ab21ae922c202adf

Analysis

max time kernel
136s
max time network
162s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
22/11/2022, 02:02

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General

Target
file.exe
Size 1.3MB
Sample221122-cf43ysfa96
SHA256 5f7d5ac5776d86b03306916e6a5bbba4ff53a8fa302ee520ab21ae922c202adf
MD5 dd5fadcdf553636639cf856a7030b2d7
SHA1 d316400259759fafbd410a8aa8dfb881badf9640
SHA512 b763387142067afe48be83b4a33b833afc43560404a243fe28174949a3879bf840588106053d22712d7ccb09fff44a2934c71e15f8793e5bc4362634c5047df2
SSDEEP 24576:9izgWp2FFskB1I5wYJ/xZNF34s8YzAiExkayPU21G05HvQKt8MkCawgZIY7eCLx7:Wg8251SRj73Fb0yPPUbnCavNeViv
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
4116	is-RO0F1.tmp
3456	PrintFolders.exe
2260	k9lBLhp0kve.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-1-5-21-4060001867-1434967833-2212371794-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4116	is-RO0F1.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\unins000.dat	is-RO0F1.tmp
File created	C:\Program Files (x86)\PrintFolders\is-CINEN.tmp	is-RO0F1.tmp
File created	C:\Program Files (x86)\PrintFolders\is-KL4BT.tmp	is-RO0F1.tmp
File created	C:\Program Files (x86)\PrintFolders\is-3LDK7.tmp	is-RO0F1.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-RO0F1.tmp
File created	C:\Program Files (x86)\PrintFolders\is-OBTRH.tmp	is-RO0F1.tmp
File created	C:\Program Files (x86)\PrintFolders\is-3JDET.tmp	is-RO0F1.tmp
File created	C:\Program Files (x86)\PrintFolders\is-RIJU2.tmp	is-RO0F1.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-RO0F1.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
4480	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3456	PrintFolders.exe
3456	PrintFolders.exe
3456	PrintFolders.exe
3456	PrintFolders.exe
3456	PrintFolders.exe
3456	PrintFolders.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3456	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4480	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 5108 wrote to memory of 4116	5108	file.exe	83
PID 5108 wrote to memory of 4116	5108	file.exe	83
PID 5108 wrote to memory of 4116	5108	file.exe	83
PID 4116 wrote to memory of 3456	4116	is-RO0F1.tmp	84
PID 4116 wrote to memory of 3456	4116	is-RO0F1.tmp	84
PID 4116 wrote to memory of 3456	4116	is-RO0F1.tmp	84
PID 3456 wrote to memory of 2260	3456	PrintFolders.exe	85
PID 3456 wrote to memory of 2260	3456	PrintFolders.exe	85
PID 3456 wrote to memory of 2260	3456	PrintFolders.exe	85
PID 3456 wrote to memory of 2588	3456	PrintFolders.exe	100
PID 3456 wrote to memory of 2588	3456	PrintFolders.exe	100
PID 3456 wrote to memory of 2588	3456	PrintFolders.exe	100
PID 2588 wrote to memory of 4480	2588	cmd.exe	103
PID 2588 wrote to memory of 4480	2588	cmd.exe	103
PID 2588 wrote to memory of 4480	2588	cmd.exe	103

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:5108
- C:\Users\Admin\AppData\Local\Temp\is-5BJFI.tmp\is-RO0F1.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-5BJFI.tmp\is-RO0F1.tmp" /SL4 $C01C2 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1084405 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4116
- - 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:3456
  - - C:\Users\Admin\AppData\Roaming\{6fe6a3c0-6208-11ed-b8c9-806e6f6e6963}\k9lBLhp0kve.exe
      4⤵
      Executes dropped EXE
      PID:2260
  - - 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:2588
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4480

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 742bc6bf089146e374af979f4dfaabd3fb0ee160ad510d3305079155db6a728a
MD5 544acc8db8170ceb379baea96ec08557
SHA1 8b962a3142773742324cb1fd9d46d32b3770918e
SHA512 716f288def4acde44972a74999b88bc09958c19aab6a91ac5a3e210b0adb85674513e3e3bbf4c1b6b1dd3d47cba049daa38cbd41e16bfbec80213a6e356a9e9d
SSDEEP 24576:O+5b+ah+M+0+/z+FmNwxS+G9+uRlP26CxMPVQ/uRHZ7DvxJeUAKXytMLLBAZyZ4U:X4awVNCIK5xuR06+KtDjeUAKCui81l3
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 1.5MB
SHA256 742bc6bf089146e374af979f4dfaabd3fb0ee160ad510d3305079155db6a728a
MD5 544acc8db8170ceb379baea96ec08557
SHA1 8b962a3142773742324cb1fd9d46d32b3770918e
SHA512 716f288def4acde44972a74999b88bc09958c19aab6a91ac5a3e210b0adb85674513e3e3bbf4c1b6b1dd3d47cba049daa38cbd41e16bfbec80213a6e356a9e9d
SSDEEP 24576:O+5b+ah+M+0+/z+FmNwxS+G9+uRlP26CxMPVQ/uRHZ7DvxJeUAKXytMLLBAZyZ4U:X4awVNCIK5xuR06+KtDjeUAKCui81l3
MD5 SHA1 SHA512 SSDEEP

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is-RO0F1.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-5BJFI.tmp\is-RO0F1.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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is-RO0F1.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-5BJFI.tmp\is-RO0F1.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-6HH00.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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k9lBLhp0kve.exe

Path C:\Users\Admin\AppData\Roaming\{6fe6a3c0-6208-11ed-b8c9-806e6f6e6963}\k9lBLhp0kve.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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k9lBLhp0kve.exe

Path C:\Users\Admin\AppData\Roaming\{6fe6a3c0-6208-11ed-b8c9-806e6f6e6963}\k9lBLhp0kve.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/3456-143-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/3456-144-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/3456-142-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/3456-149-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/3456-150-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/3456-155-0x0000000000400000-0x000000000137F000-memory.dmp

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memory/5108-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/5108-148-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/5108-134-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/5108-156-0x0000000000400000-0x0000000000413000-memory.dmp

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