nymaim | 9372d7189bfa840e3e9de05b271c54d1df422054b6ed46ff4af1c4e54aefdf11

Analysis

max time kernel
94s
max time network
161s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
08/12/2022, 01:17

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General

Target
file.exe
Size 2.2MB
Sample221208-bndejagf77
SHA256 9372d7189bfa840e3e9de05b271c54d1df422054b6ed46ff4af1c4e54aefdf11
MD5 788bdee72b88317e297b4059908ab977
SHA1 e702c1313866bbbab2261e5fe495b518b7258cdf
SHA512 77757f3835d5f7ecb9db0b53042362fd3e207ffc375017784d7d196b393a66555816e4e16b1f32b365f4d9aceaed29e26cb855a3c75806e78e55ad7b1a727e6e
SSDEEP 49152:u0/L5vujY6ojyAca8WBpuSAdGX2OVGs+3O3h/eUHJcRWyoOZPdpkZwN41kg:uuucFcrSAYmyGL3Sh/eUHJcFZ1iH
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
876	is-S79J4.tmp
2628	RintFolders.exe
1528	6E5Ns51GfnO.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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	RintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
876	is-S79J4.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-S79J4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MH4S2.tmp	is-S79J4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-79ACH.tmp	is-S79J4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-CSJ5P.tmp	is-S79J4.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-S79J4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-0HDNQ.tmp	is-S79J4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-BT3ON.tmp	is-S79J4.tmp
File created	C:\Program Files (x86)\PrintFolders\is-OMDRS.tmp	is-S79J4.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\RintFolders.exe	is-S79J4.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
4256	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2628	RintFolders.exe
2628	RintFolders.exe
2628	RintFolders.exe
2628	RintFolders.exe
2628	RintFolders.exe
2628	RintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4256	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4772 wrote to memory of 876	4772	file.exe	78
PID 4772 wrote to memory of 876	4772	file.exe	78
PID 4772 wrote to memory of 876	4772	file.exe	78
PID 876 wrote to memory of 2628	876	is-S79J4.tmp	79
PID 876 wrote to memory of 2628	876	is-S79J4.tmp	79
PID 876 wrote to memory of 2628	876	is-S79J4.tmp	79
PID 2628 wrote to memory of 1528	2628	RintFolders.exe	80
PID 2628 wrote to memory of 1528	2628	RintFolders.exe	80
PID 2628 wrote to memory of 1528	2628	RintFolders.exe	80
PID 2628 wrote to memory of 2772	2628	RintFolders.exe	89
PID 2628 wrote to memory of 2772	2628	RintFolders.exe	89
PID 2628 wrote to memory of 2772	2628	RintFolders.exe	89
PID 2772 wrote to memory of 4256	2772	cmd.exe	91
PID 2772 wrote to memory of 4256	2772	cmd.exe	91
PID 2772 wrote to memory of 4256	2772	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4772
- C:\Users\Admin\AppData\Local\Temp\is-DNH20.tmp\is-S79J4.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-DNH20.tmp\is-S79J4.tmp" /SL4 $D0064 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2043508 73728
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:876
- - C:\Program Files (x86)\PrintFolders\RintFolders.exe
    "C:\Program Files (x86)\PrintFolders\RintFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:2628
  - - C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\6E5Ns51GfnO.exe
      4⤵
      Executes dropped EXE
      PID:1528
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "RintFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\RintFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2772
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "RintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4256

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

RintFolders.exe

Path C:\Program Files (x86)\PrintFolders\RintFolders.exe
Size 3.3MB
SHA256 a469506b280b7ae5c076dbb1e8493725c306525d2420c4af1a4b9ce2e413ebaa
MD5 5139d9885b8b20d70484cb69abeb79bb
SHA1 354dcd3d687c227350867bc101fb84df7eefec4e
SHA512 c6ce456eb58abbec16813f02e17645b1dd8852993f0e807b6a037a4634bd403ad0216bae160f83dc6dd01a06c10750dc69c3be65329a9f9ab42f8c5b3d3010ac
SSDEEP 98304:YnvtNK5tCJ49Y4AGyDb1n8FJhtXTlvoc5:YsZ5
MD5 SHA1 SHA512 SSDEEP

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RintFolders.exe

Path C:\Program Files (x86)\PrintFolders\RintFolders.exe
Size 3.3MB
SHA256 a469506b280b7ae5c076dbb1e8493725c306525d2420c4af1a4b9ce2e413ebaa
MD5 5139d9885b8b20d70484cb69abeb79bb
SHA1 354dcd3d687c227350867bc101fb84df7eefec4e
SHA512 c6ce456eb58abbec16813f02e17645b1dd8852993f0e807b6a037a4634bd403ad0216bae160f83dc6dd01a06c10750dc69c3be65329a9f9ab42f8c5b3d3010ac
SSDEEP 98304:YnvtNK5tCJ49Y4AGyDb1n8FJhtXTlvoc5:YsZ5
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-6F70C.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-S79J4.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-DNH20.tmp\is-S79J4.tmp
Size 665KB
SHA256 2a841ad3820292ff2ab96429635062d0984d0b221e8bd7650777a1c51043b722
MD5 21efb90aabcda42c1232f008bd66fd99
SHA1 563835721536bbd8310eb1dc2fa18966ddffff3d
SHA512 106432d5d58bd2f904cbb9f28771c7b95ccbdd7cdf506b190f5968dbf552ae4ed54cd2f46624ab47cc730c565b7d8d7de7cc51609540df05d0a46c932c20c36e
SSDEEP 12288:/h5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvX4xO6:p5NoqWolrP837JzHvA6yknyWFxvoxO6
MD5 SHA1 SHA512 SSDEEP

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is-S79J4.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-DNH20.tmp\is-S79J4.tmp
Size 665KB
SHA256 2a841ad3820292ff2ab96429635062d0984d0b221e8bd7650777a1c51043b722
MD5 21efb90aabcda42c1232f008bd66fd99
SHA1 563835721536bbd8310eb1dc2fa18966ddffff3d
SHA512 106432d5d58bd2f904cbb9f28771c7b95ccbdd7cdf506b190f5968dbf552ae4ed54cd2f46624ab47cc730c565b7d8d7de7cc51609540df05d0a46c932c20c36e
SSDEEP 12288:/h5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvX4xO6:p5NoqWolrP837JzHvA6yknyWFxvoxO6
MD5 SHA1 SHA512 SSDEEP

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6E5Ns51GfnO.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\6E5Ns51GfnO.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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6E5Ns51GfnO.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\6E5Ns51GfnO.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/2628-143-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/2628-144-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/2628-142-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/2628-149-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/2628-153-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/2628-156-0x0000000000400000-0x000000000154A000-memory.dmp

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memory/4772-132-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4772-134-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4772-148-0x0000000000400000-0x0000000000418000-memory.dmp

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memory/4772-157-0x0000000000400000-0x0000000000418000-memory.dmp

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