nymaim | 614046c3410cd7f94a95008420a3b6ddc66b96ecf693644820461f0d50254e82

General

Target

file.exe
Size

3.7MB
MD5

b31a5624749d5ad40cb622fce2f36047
SHA1

33073473cf03c8dbfa3a7abbaa01bba2bd06af09
SHA256

614046c3410cd7f94a95008420a3b6ddc66b96ecf693644820461f0d50254e82
SHA512

31f675c7b71e51d349c32c3eb6152d8d071936697dfc8f04f25079385278abb7db38cf92b461ef6b3a3d9bc780a2475c8d4b1380f96ecf1c7ac515057375f70f
SSDEEP

98304:aDs2pEnN2Cm7rWM+/S9aU3vnbykVaXAglqs2UdWDiyne:QsIEnMCSCh/luPbtQA+JY2ye

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
820	is-PNR5N.tmp
1384	PrintFolders.exe
4764	64KDKb.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
820	is-PNR5N.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-US886.tmp	is-PNR5N.tmp
File created	C:\Program Files (x86)\PrintFolders\is-PBC43.tmp	is-PNR5N.tmp
File created	C:\Program Files (x86)\PrintFolders\is-ATVPR.tmp	is-PNR5N.tmp
File created	C:\Program Files (x86)\PrintFolders\is-D72BL.tmp	is-PNR5N.tmp
File created	C:\Program Files (x86)\PrintFolders\is-S9KMM.tmp	is-PNR5N.tmp
File created	C:\Program Files (x86)\PrintFolders\is-LO92U.tmp	is-PNR5N.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-PNR5N.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-PNR5N.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-PNR5N.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
4636	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1384	PrintFolders.exe
1384	PrintFolders.exe
1384	PrintFolders.exe
1384	PrintFolders.exe
1384	PrintFolders.exe
1384	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4636	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3224 wrote to memory of 820	3224	file.exe	83
PID 3224 wrote to memory of 820	3224	file.exe	83
PID 3224 wrote to memory of 820	3224	file.exe	83
PID 820 wrote to memory of 1384	820	is-PNR5N.tmp	84
PID 820 wrote to memory of 1384	820	is-PNR5N.tmp	84
PID 820 wrote to memory of 1384	820	is-PNR5N.tmp	84
PID 1384 wrote to memory of 4764	1384	PrintFolders.exe	85
PID 1384 wrote to memory of 4764	1384	PrintFolders.exe	85
PID 1384 wrote to memory of 4764	1384	PrintFolders.exe	85
PID 1384 wrote to memory of 4860	1384	PrintFolders.exe	87
PID 1384 wrote to memory of 4860	1384	PrintFolders.exe	87
PID 1384 wrote to memory of 4860	1384	PrintFolders.exe	87
PID 4860 wrote to memory of 4636	4860	cmd.exe	89
PID 4860 wrote to memory of 4636	4860	cmd.exe	89
PID 4860 wrote to memory of 4636	4860	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3224
- C:\Users\Admin\AppData\Local\Temp\is-GD56Q.tmp\is-PNR5N.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-GD56Q.tmp\is-PNR5N.tmp" /SL4 $1D01DC "C:\Users\Admin\AppData\Local\Temp\file.exe" 3642162 96256
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:820
- - 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:1384
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\64KDKb.exe
      4⤵
      Executes dropped EXE
      PID:4764
  - - 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:4860
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4636

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
6.3MB

MD5
9ac0d9f7e820432dfe6a79f935295f39

SHA1
56f3877a4edaf194a429c84c219af14929bec1df

SHA256
7e158485b83ce4f9c6b0210cb109c5ed0813dd0d977cf74b5d40e160227409dd

SHA512
ce3c50a2985b8c76994112f22709fd8778d2e5787eae07d9fff12943084e6dfd66cf40c7e99b122713325098bdd671deeb7c622588e332bb522a699427c943a7

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

Filesize
6.3MB

MD5
9ac0d9f7e820432dfe6a79f935295f39

SHA1
56f3877a4edaf194a429c84c219af14929bec1df

SHA256
7e158485b83ce4f9c6b0210cb109c5ed0813dd0d977cf74b5d40e160227409dd

SHA512
ce3c50a2985b8c76994112f22709fd8778d2e5787eae07d9fff12943084e6dfd66cf40c7e99b122713325098bdd671deeb7c622588e332bb522a699427c943a7

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-GD56Q.tmp\is-PNR5N.tmp

Filesize
687KB

MD5
075f33da1ee1e9c480243cac029b3c3e

SHA1
496cba41dd1b8878f7e10c3affb293231ca97ed3

SHA256
cec47d181cf1dad856463fc237ead179ffa5ab1f2aeeec442a99ee83c7db5cb2

SHA512
3c90572fa0151a9c1d557109f995f2093b9a043808675bd6ff6fd543bf364d826be04d0dfd60062670e4e8edb8f7b24f8bbd5a5f056c3f628aacf2175c3fe8db

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-GD56Q.tmp\is-PNR5N.tmp

Filesize
687KB

MD5
075f33da1ee1e9c480243cac029b3c3e

SHA1
496cba41dd1b8878f7e10c3affb293231ca97ed3

SHA256
cec47d181cf1dad856463fc237ead179ffa5ab1f2aeeec442a99ee83c7db5cb2

SHA512
3c90572fa0151a9c1d557109f995f2093b9a043808675bd6ff6fd543bf364d826be04d0dfd60062670e4e8edb8f7b24f8bbd5a5f056c3f628aacf2175c3fe8db

Download Submit
C:\Users\Admin\AppData\Local\Temp\is-J6IFK.tmp\_iscrypt.dll

Filesize
2KB

MD5
a69559718ab506675e907fe49deb71e9

SHA1
bc8f404ffdb1960b50c12ff9413c893b56f2e36f

SHA256
2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

SHA512
e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\64KDKb.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\64KDKb.exe

Filesize
72KB

MD5
3fb36cb0b7172e5298d2992d42984d06

SHA1
439827777df4a337cbb9fa4a4640d0d3fa1738b7

SHA256
27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

SHA512
6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

Download Submit
memory/1384-143-0x0000000000400000-0x0000000001842000-memory.dmp

Filesize
20.3MB

Download
memory/1384-142-0x0000000000400000-0x0000000001842000-memory.dmp

Filesize
20.3MB

Download
memory/1384-147-0x0000000010000000-0x000000001001B000-memory.dmp

Filesize
108KB

Download
memory/1384-151-0x0000000000400000-0x0000000001842000-memory.dmp

Filesize
20.3MB

Download
memory/1384-154-0x0000000000400000-0x0000000001842000-memory.dmp

Filesize
20.3MB

Download
memory/3224-132-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/3224-137-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download
memory/3224-155-0x0000000000400000-0x000000000041E000-memory.dmp

Filesize
120KB

Download

Analysis

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