nymaim | 4ef0170823e7291da5149c69b8cec22ee9a0d1f5defd31e975fac74d98fcd089

Analysis

max time kernel
90s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
22/11/2022, 21:32

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General

Target
file.exe
Size 1.2MB
Sample221122-1dletsdc7x
SHA256 4ef0170823e7291da5149c69b8cec22ee9a0d1f5defd31e975fac74d98fcd089
MD5 80d755ca4aa171dcfd647592c4ddbf5a
SHA1 21b9241816511a9ae80d516016fd41d26b8c4c1c
SHA512 b42b64a7f46d9f53ea97e679b8725088c9b52c48243a802323ef770ce173cc8d1a0ecd07138690d97e528e24e402bec7d804167ab753a750bc91443563e2c652
SSDEEP 24576:lizElQCV/+yEDbV7wUBox23BADhzwoGYi/mZnmZ35wgZIY7eCLxYih:O4d/+3VI2xE0oGYycnmF5vNeVih
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
1624	is-F23UA.tmp
740	PrintFolders.exe
4396	31ACWFld3j4.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
1624	is-F23UA.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-VHJV6.tmp	is-F23UA.tmp
File created	C:\Program Files (x86)\PrintFolders\is-VG02R.tmp	is-F23UA.tmp
File created	C:\Program Files (x86)\PrintFolders\is-6KRV5.tmp	is-F23UA.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-F23UA.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-F23UA.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-F23UA.tmp
File created	C:\Program Files (x86)\PrintFolders\is-IT3VT.tmp	is-F23UA.tmp
File created	C:\Program Files (x86)\PrintFolders\is-QEHPB.tmp	is-F23UA.tmp
File created	C:\Program Files (x86)\PrintFolders\is-PLF6F.tmp	is-F23UA.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
4500	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
740	PrintFolders.exe
740	PrintFolders.exe
740	PrintFolders.exe
740	PrintFolders.exe
740	PrintFolders.exe
740	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4500	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4788 wrote to memory of 1624	4788	file.exe	81
PID 4788 wrote to memory of 1624	4788	file.exe	81
PID 4788 wrote to memory of 1624	4788	file.exe	81
PID 1624 wrote to memory of 740	1624	is-F23UA.tmp	82
PID 1624 wrote to memory of 740	1624	is-F23UA.tmp	82
PID 1624 wrote to memory of 740	1624	is-F23UA.tmp	82
PID 740 wrote to memory of 4396	740	PrintFolders.exe	83
PID 740 wrote to memory of 4396	740	PrintFolders.exe	83
PID 740 wrote to memory of 4396	740	PrintFolders.exe	83
PID 740 wrote to memory of 5016	740	PrintFolders.exe	92
PID 740 wrote to memory of 5016	740	PrintFolders.exe	92
PID 740 wrote to memory of 5016	740	PrintFolders.exe	92
PID 5016 wrote to memory of 4500	5016	cmd.exe	94
PID 5016 wrote to memory of 4500	5016	cmd.exe	94
PID 5016 wrote to memory of 4500	5016	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4788
- C:\Users\Admin\AppData\Local\Temp\is-VQH8S.tmp\is-F23UA.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-VQH8S.tmp\is-F23UA.tmp" /SL4 $60090 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1072181 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:1624
- - 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:740
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\31ACWFld3j4.exe
      4⤵
      Executes dropped EXE
      PID:4396
  - - 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:5016
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:4500

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 1.4MB
SHA256 6e68324b15e808f2ef7a44d1f87f825196a182747782e481e9fbfa3acb51bf24
MD5 78aea1219852e01afbebd2b6eb6ddb07
SHA1 ab6b2be7b3ebc700c9bd7cae7f9eeb5bab33aaa2
SHA512 459b7a8b47e9bd60173998778ff9b2a068a965203688efac1f82e08c69c2f8daf8ae5daed7b3230f093c509735bbaddc646af68953af26026783c50b0e823acc
SSDEEP 24576:K+f+P1Kqh2+x+L+s0f+g+4y+wCSW4qZKBdtKTDYB42vYajJIaxBh3hr:DGP1Kq5gSs0Gp4bJCesj14iv7hr
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 1.4MB
SHA256 6e68324b15e808f2ef7a44d1f87f825196a182747782e481e9fbfa3acb51bf24
MD5 78aea1219852e01afbebd2b6eb6ddb07
SHA1 ab6b2be7b3ebc700c9bd7cae7f9eeb5bab33aaa2
SHA512 459b7a8b47e9bd60173998778ff9b2a068a965203688efac1f82e08c69c2f8daf8ae5daed7b3230f093c509735bbaddc646af68953af26026783c50b0e823acc
SSDEEP 24576:K+f+P1Kqh2+x+L+s0f+g+4y+wCSW4qZKBdtKTDYB42vYajJIaxBh3hr:DGP1Kq5gSs0Gp4bJCesj14iv7hr
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-7IM2T.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-F23UA.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-VQH8S.tmp\is-F23UA.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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is-F23UA.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-VQH8S.tmp\is-F23UA.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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31ACWFld3j4.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\31ACWFld3j4.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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31ACWFld3j4.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\31ACWFld3j4.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/740-151-0x0000000000400000-0x0000000001373000-memory.dmp

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memory/740-142-0x0000000000400000-0x0000000001373000-memory.dmp

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memory/740-143-0x0000000000400000-0x0000000001373000-memory.dmp

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memory/740-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/740-154-0x0000000000400000-0x0000000001373000-memory.dmp

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memory/4788-138-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4788-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4788-155-0x0000000000400000-0x0000000000413000-memory.dmp

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