nymaim | 2f92ffe52158587d6e9d88114ac342be60d625f3977990185827ec202e9d049a

Analysis

max time kernel
189s
max time network
186s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
03/12/2022, 17:50

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General

Target
file.exe
Size 3.6MB
Sample221203-wek38sfc61
SHA256 2f92ffe52158587d6e9d88114ac342be60d625f3977990185827ec202e9d049a
MD5 519f7c13edc48674c9ac115050b84aa6
SHA1 0395d75e4ae8d4b7caccc908c227a16f116da80e
SHA512 b09c28b2d29be4f7b833479e84b9682200215046a5caf94a892eb71eb16ce35acfd80c67d9fa95ebf16ca274dca95bf6a0dfa57fd579103a277fa02e86cb2aa4
SSDEEP 98304:Au4g5lq1Obh2oT4YEQCw5t/zkAVefBHreIwedXcyK:h4g5QzK904xkzZihedXcyK
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
1240	is-RK5KK.tmp
1400	PrintFolders.exe
2884	WXg9R.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
1240	is-RK5KK.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 opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-RK5KK.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-RK5KK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MCHBH.tmp	is-RK5KK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-AR0B1.tmp	is-RK5KK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-GM5MQ.tmp	is-RK5KK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-OICOV.tmp	is-RK5KK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-LV159.tmp	is-RK5KK.tmp
File created	C:\Program Files (x86)\PrintFolders\is-88DQ9.tmp	is-RK5KK.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-RK5KK.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
3452	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1400	PrintFolders.exe
1400	PrintFolders.exe
1400	PrintFolders.exe
1400	PrintFolders.exe
1400	PrintFolders.exe
1400	PrintFolders.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1400	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3452	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3380 wrote to memory of 1240	3380	file.exe	81
PID 3380 wrote to memory of 1240	3380	file.exe	81
PID 3380 wrote to memory of 1240	3380	file.exe	81
PID 1240 wrote to memory of 1400	1240	is-RK5KK.tmp	82
PID 1240 wrote to memory of 1400	1240	is-RK5KK.tmp	82
PID 1240 wrote to memory of 1400	1240	is-RK5KK.tmp	82
PID 1400 wrote to memory of 2884	1400	PrintFolders.exe	83
PID 1400 wrote to memory of 2884	1400	PrintFolders.exe	83
PID 1400 wrote to memory of 2884	1400	PrintFolders.exe	83
PID 1400 wrote to memory of 960	1400	PrintFolders.exe	97
PID 1400 wrote to memory of 960	1400	PrintFolders.exe	97
PID 1400 wrote to memory of 960	1400	PrintFolders.exe	97
PID 960 wrote to memory of 3452	960	cmd.exe	100
PID 960 wrote to memory of 3452	960	cmd.exe	100
PID 960 wrote to memory of 3452	960	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3380
- C:\Users\Admin\AppData\Local\Temp\is-MILKG.tmp\is-RK5KK.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-MILKG.tmp\is-RK5KK.tmp" /SL4 $801E2 "C:\Users\Admin\AppData\Local\Temp\file.exe" 3499095 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:1240
- - 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:1400
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\WXg9R.exe
      4⤵
      Executes dropped EXE
      PID:2884
  - - 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:960
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:3452

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 5.9MB
SHA256 58ae4c50eb75488bb936e621bb2b16e9f4424e095fd600893afbff07fff865fe
MD5 4e261d62c319ba9a5fcc14051c50eac0
SHA1 c129a55e022d90b3d1726380cfe9775e6015c5bf
SHA512 04270dd241629267387a017a2376b9d10490a0e67c9d535ddc26579ce63a808c6a5f742cca2857568b3e5eda997b1a7f169f154a900738b75c4d7abc33ddece4
SSDEEP 98304:ZmVEJjd75PniyBES6w1BOkh/sWnyE6b5A5:gVu75FEw75
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 5.9MB
SHA256 58ae4c50eb75488bb936e621bb2b16e9f4424e095fd600893afbff07fff865fe
MD5 4e261d62c319ba9a5fcc14051c50eac0
SHA1 c129a55e022d90b3d1726380cfe9775e6015c5bf
SHA512 04270dd241629267387a017a2376b9d10490a0e67c9d535ddc26579ce63a808c6a5f742cca2857568b3e5eda997b1a7f169f154a900738b75c4d7abc33ddece4
SSDEEP 98304:ZmVEJjd75PniyBES6w1BOkh/sWnyE6b5A5:gVu75FEw75
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-B1MPN.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-RK5KK.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-MILKG.tmp\is-RK5KK.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-RK5KK.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-MILKG.tmp\is-RK5KK.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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WXg9R.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\WXg9R.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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WXg9R.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\WXg9R.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/1400-152-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/1400-143-0x0000000000400000-0x00000000017EC000-memory.dmp

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memory/1400-144-0x0000000000400000-0x00000000017EC000-memory.dmp

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memory/1400-146-0x0000000000400000-0x00000000017EC000-memory.dmp

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memory/1400-147-0x0000000000400000-0x00000000017EC000-memory.dmp

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memory/1400-158-0x0000000000400000-0x00000000017EC000-memory.dmp

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memory/1400-151-0x0000000000400000-0x00000000017EC000-memory.dmp

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memory/3380-145-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3380-135-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3380-133-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3380-159-0x0000000000400000-0x0000000000413000-memory.dmp

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