nymaim | b2048219ca9ec58e36499f7159bf02f89f5a8ea2d022cd4eecf98ce502fccda3

General

Target

file.exe
Size

1.3MB
MD5

6ae0d18d5800d1c07ea7489917b60d91
SHA1

3260602c0d1ecac68838cdffd90a8a6fbfa65448
SHA256

b2048219ca9ec58e36499f7159bf02f89f5a8ea2d022cd4eecf98ce502fccda3
SHA512

bdf2a4c016817d9a1209717fa9ed43792ae28b678aaa0deeb6cf7e060d37a9d1b6f2fd5ff76a287a6cd7be45183631416987885eb356d174141ebb0a9c07d96a
SSDEEP

24576:Niz30baNb6apeoicRhFncVXAehrdRm91Z5Zkmh4zgZIY7eCLxYiO:myaNb6apzRncVXPhZRMVhvNeViO

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

C2

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
4848	is-04TBO.tmp
1748	PrintFolders.exe
1288	3d3ZeC.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-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4848	is-04TBO.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-04TBO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-L51PO.tmp	is-04TBO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-P1EEM.tmp	is-04TBO.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-04TBO.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-04TBO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-TU7NI.tmp	is-04TBO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-C0G5A.tmp	is-04TBO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-TGKGA.tmp	is-04TBO.tmp
File created	C:\Program Files (x86)\PrintFolders\is-H7L6H.tmp	is-04TBO.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
1372	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1748	PrintFolders.exe
1748	PrintFolders.exe
1748	PrintFolders.exe
1748	PrintFolders.exe
1748	PrintFolders.exe
1748	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1372	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4296 wrote to memory of 4848	4296	file.exe	80
PID 4296 wrote to memory of 4848	4296	file.exe	80
PID 4296 wrote to memory of 4848	4296	file.exe	80
PID 4848 wrote to memory of 1748	4848	is-04TBO.tmp	81
PID 4848 wrote to memory of 1748	4848	is-04TBO.tmp	81
PID 4848 wrote to memory of 1748	4848	is-04TBO.tmp	81
PID 1748 wrote to memory of 1288	1748	PrintFolders.exe	82
PID 1748 wrote to memory of 1288	1748	PrintFolders.exe	82
PID 1748 wrote to memory of 1288	1748	PrintFolders.exe	82
PID 1748 wrote to memory of 1680	1748	PrintFolders.exe	84
PID 1748 wrote to memory of 1680	1748	PrintFolders.exe	84
PID 1748 wrote to memory of 1680	1748	PrintFolders.exe	84
PID 1680 wrote to memory of 1372	1680	cmd.exe	86
PID 1680 wrote to memory of 1372	1680	cmd.exe	86
PID 1680 wrote to memory of 1372	1680	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4296
- C:\Users\Admin\AppData\Local\Temp\is-JSVGK.tmp\is-04TBO.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-JSVGK.tmp\is-04TBO.tmp" /SL4 $A005A "C:\Users\Admin\AppData\Local\Temp\file.exe" 1117182 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4848
- - 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:1748
  - - C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\3d3ZeC.exe
      4⤵
      Executes dropped EXE
      PID:1288
  - - 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:1680
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:1372

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\PrintFolders\PrintFolders.exe

Filesize
1.5MB

MD5
736dd30de04b58961408616eee61dc3a

SHA1
3b9d873339304018b5738ff8c7febed2d167327e

SHA256
2e69a1887a84b0915cd553580e1c8c67154bd3bffe7ced6f206afcd967a2a759

SHA512
9fe7e297d73edf2078a2b9f2fb290cc125db14b887e65181f9112792ac02ef2be71ee7142b550cdbc59b84b52394de78d638c148f0bef60411d78e8393ed7c8f

Download Submit
C:\Program Files (x86)\PrintFolders\PrintFolders.exe

Filesize
1.5MB

MD5
736dd30de04b58961408616eee61dc3a

SHA1
3b9d873339304018b5738ff8c7febed2d167327e

SHA256
2e69a1887a84b0915cd553580e1c8c67154bd3bffe7ced6f206afcd967a2a759

SHA512
9fe7e297d73edf2078a2b9f2fb290cc125db14b887e65181f9112792ac02ef2be71ee7142b550cdbc59b84b52394de78d638c148f0bef60411d78e8393ed7c8f

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-2N6CK.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-JSVGK.tmp\is-04TBO.tmp

Filesize
643KB

MD5
85b94e72c3f2d2b5464e2aaf3c9e242a

SHA1
ce7ccae5f50a990d059d59292d4a332979e162ba

SHA256
1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7

SHA512
c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-JSVGK.tmp\is-04TBO.tmp

Filesize
643KB

MD5
85b94e72c3f2d2b5464e2aaf3c9e242a

SHA1
ce7ccae5f50a990d059d59292d4a332979e162ba

SHA256
1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7

SHA512
c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\3d3ZeC.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\3d3ZeC.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/1748-143-0x0000000000400000-0x000000000137F000-memory.dmp

Filesize
15.5MB

Download
memory/1748-142-0x0000000000400000-0x000000000137F000-memory.dmp

Filesize
15.5MB

Download
memory/1748-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/1748-151-0x0000000000400000-0x000000000137F000-memory.dmp

Filesize
15.5MB

Download
memory/1748-154-0x0000000000400000-0x000000000137F000-memory.dmp

Filesize
15.5MB

Download
memory/4296-132-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/4296-137-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download
memory/4296-155-0x0000000000400000-0x0000000000413000-memory.dmp

Filesize
76KB

Download

Analysis

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