nymaim | a2b34283f7cce75e3542f54bacba5100d46717b36325445d34f7443d31ebf31e

Analysis

max time kernel
144s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
22/11/2022, 22:01

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General

Target
file.exe
Size 1.2MB
Sample221122-1w7qsaae82
SHA256 a2b34283f7cce75e3542f54bacba5100d46717b36325445d34f7443d31ebf31e
MD5 c474e7095db18f9b89df05d7154c7cea
SHA1 aaac96f22e20c016badf40ce8e0bb6c703a6e58a
SHA512 c29e31a160ff833719a716cc4d96f5f4eac58557b30198a873fb425c8f6cab55cb1c6b998ca73fd402d8689285f5bbe7e8ae83cd8e619899ce9cc8c58c2bba01
SSDEEP 24576:ZizKBYhoYosjVUpKPl0fv+N9R4+e39ytc9y/EvRiWt3RcgZIY7eCLxYiX:SnWnsyON9R15t3sFpR7NeViX
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
3708	is-C4V82.tmp
4968	PrintFolders.exe
4924	jVfRU.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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	PrintFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
3708	is-C4V82.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\unins000.dat	is-C4V82.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-C4V82.tmp
File created	C:\Program Files (x86)\PrintFolders\is-H9250.tmp	is-C4V82.tmp
File created	C:\Program Files (x86)\PrintFolders\is-9IJD0.tmp	is-C4V82.tmp
File created	C:\Program Files (x86)\PrintFolders\is-NS66S.tmp	is-C4V82.tmp
File created	C:\Program Files (x86)\PrintFolders\is-T1K58.tmp	is-C4V82.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-C4V82.tmp
File created	C:\Program Files (x86)\PrintFolders\is-TS8AQ.tmp	is-C4V82.tmp
File created	C:\Program Files (x86)\PrintFolders\is-Q79C5.tmp	is-C4V82.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
688	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4968	PrintFolders.exe
4968	PrintFolders.exe
4968	PrintFolders.exe
4968	PrintFolders.exe
4968	PrintFolders.exe
4968	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	688	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2760 wrote to memory of 3708	2760	file.exe	82
PID 2760 wrote to memory of 3708	2760	file.exe	82
PID 2760 wrote to memory of 3708	2760	file.exe	82
PID 3708 wrote to memory of 4968	3708	is-C4V82.tmp	83
PID 3708 wrote to memory of 4968	3708	is-C4V82.tmp	83
PID 3708 wrote to memory of 4968	3708	is-C4V82.tmp	83
PID 4968 wrote to memory of 4924	4968	PrintFolders.exe	84
PID 4968 wrote to memory of 4924	4968	PrintFolders.exe	84
PID 4968 wrote to memory of 4924	4968	PrintFolders.exe	84
PID 4968 wrote to memory of 1428	4968	PrintFolders.exe	86
PID 4968 wrote to memory of 1428	4968	PrintFolders.exe	86
PID 4968 wrote to memory of 1428	4968	PrintFolders.exe	86
PID 1428 wrote to memory of 688	1428	cmd.exe	88
PID 1428 wrote to memory of 688	1428	cmd.exe	88
PID 1428 wrote to memory of 688	1428	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2760
- C:\Users\Admin\AppData\Local\Temp\is-H3037.tmp\is-C4V82.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-H3037.tmp\is-C4V82.tmp" /SL4 $701C6 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1069647 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:3708
- - 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:4968
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\jVfRU.exe
      4⤵
      Executes dropped EXE
      PID:4924
  - - 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:1428
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:688

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 1ef651bd88a707c5797458da55c73b7eb24702b158a69c8746ccf58b5396de89
MD5 cfd96cea8f1b19a97ffebe446ad86dde
SHA1 a3b5b3047e77d781cfb3a17ec3e52367df2a19e7
SHA512 f1c9f6f382b528a86129b0ce120b51362bfc0f52ca8db88220e661acefd051362192e3c8e9dfae6c03f2d66afbf7cc241e69708f6dc4543fce0ff64740de25c8
SSDEEP 24576:y+Ut+k+7+VI+yz+GjR+l3+qQ+YgaFp0PKBUVgjoRb6ocjd8IZhyTUqwQ:bUckVVByqGjAluq5R3coh82br
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 1.4MB
SHA256 1ef651bd88a707c5797458da55c73b7eb24702b158a69c8746ccf58b5396de89
MD5 cfd96cea8f1b19a97ffebe446ad86dde
SHA1 a3b5b3047e77d781cfb3a17ec3e52367df2a19e7
SHA512 f1c9f6f382b528a86129b0ce120b51362bfc0f52ca8db88220e661acefd051362192e3c8e9dfae6c03f2d66afbf7cc241e69708f6dc4543fce0ff64740de25c8
SSDEEP 24576:y+Ut+k+7+VI+yz+GjR+l3+qQ+YgaFp0PKBUVgjoRb6ocjd8IZhyTUqwQ:bUckVVByqGjAluq5R3coh82br
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-69L0K.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-C4V82.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-H3037.tmp\is-C4V82.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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is-C4V82.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-H3037.tmp\is-C4V82.tmp
Size 643KB
SHA256 1441464feeef365573af18802c464769b7d3107624fde24604f57e386f97f1a7
MD5 85b94e72c3f2d2b5464e2aaf3c9e242a
SHA1 ce7ccae5f50a990d059d59292d4a332979e162ba
SHA512 c0c27189989db482be9bda5b6b8b1441bdc5e9b0f3a414ccab4c4be516e7f99e25717845361a5b196114502faaaf21bec7aca91b497acd2e2396f49c31850880
SSDEEP 12288:Oh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvJxO0:05NoqWolrP837JzHvA6yknyWFxvJxO0
MD5 SHA1 SHA512 SSDEEP

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jVfRU.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\jVfRU.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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jVfRU.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\jVfRU.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/2760-151-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2760-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2760-134-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/2760-156-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4968-143-0x0000000000400000-0x0000000001373000-memory.dmp

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memory/4968-142-0x0000000000400000-0x0000000001373000-memory.dmp

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memory/4968-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4968-152-0x0000000000400000-0x0000000001373000-memory.dmp

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memory/4968-155-0x0000000000400000-0x0000000001373000-memory.dmp

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