nymaim | 35fbcffd4ee9e726c15debea1ca161fc415e2e117d8c282ff365b44cc848dcad

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
17/12/2022, 03:01

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General

Target
file.exe
Size 2.4MB
Sample221217-dhwp2aga99
SHA256 35fbcffd4ee9e726c15debea1ca161fc415e2e117d8c282ff365b44cc848dcad
MD5 ba6b8c1b84dfe92e78609918a22d7cf5
SHA1 2f0efac1e5986bd091789afa9bc96a3c7932d1c1
SHA512 1b28548dbeb7d68995ad0ae039fc454ce31629be826775895758baa9757c58bc978af1cb53418fbe84d185533138c834031c7ed528a6a78ae4db893a1ac1f311
SSDEEP 49152:pfAL1ibM1Iz4rbD8e3o/k/0ciC8eyR8ZMe6PRKsK+U7BqgDAr:pzM19H93o/TC8Eme6PZY7BE
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
4180	is-ST7TM.tmp
4456	obFolders.exe
716	sW7H8Al.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	obFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
4180	is-ST7TM.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-N736K.tmp	is-ST7TM.tmp
File created	C:\Program Files (x86)\PrintFolders\is-3TJ04.tmp	is-ST7TM.tmp
File created	C:\Program Files (x86)\PrintFolders\is-LLI3S.tmp	is-ST7TM.tmp
File created	C:\Program Files (x86)\PrintFolders\is-35ETI.tmp	is-ST7TM.tmp
File created	C:\Program Files (x86)\PrintFolders\is-D5I9P.tmp	is-ST7TM.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-ST7TM.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-ST7TM.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\obFolders.exe	is-ST7TM.tmp
File created	C:\Program Files (x86)\PrintFolders\is-1V6BP.tmp	is-ST7TM.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
3388	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4456	obFolders.exe
4456	obFolders.exe
4456	obFolders.exe
4456	obFolders.exe
4456	obFolders.exe
4456	obFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3388	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3140 wrote to memory of 4180	3140	file.exe	79
PID 3140 wrote to memory of 4180	3140	file.exe	79
PID 3140 wrote to memory of 4180	3140	file.exe	79
PID 4180 wrote to memory of 4456	4180	is-ST7TM.tmp	80
PID 4180 wrote to memory of 4456	4180	is-ST7TM.tmp	80
PID 4180 wrote to memory of 4456	4180	is-ST7TM.tmp	80
PID 4456 wrote to memory of 716	4456	obFolders.exe	81
PID 4456 wrote to memory of 716	4456	obFolders.exe	81
PID 4456 wrote to memory of 716	4456	obFolders.exe	81
PID 4456 wrote to memory of 3540	4456	obFolders.exe	87
PID 4456 wrote to memory of 3540	4456	obFolders.exe	87
PID 4456 wrote to memory of 3540	4456	obFolders.exe	87
PID 3540 wrote to memory of 3388	3540	cmd.exe	89
PID 3540 wrote to memory of 3388	3540	cmd.exe	89
PID 3540 wrote to memory of 3388	3540	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:3140
- C:\Users\Admin\AppData\Local\Temp\is-LBSB0.tmp\is-ST7TM.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-LBSB0.tmp\is-ST7TM.tmp" /SL4 $40028 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2215113 169472
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4180
- - C:\Program Files (x86)\PrintFolders\obFolders.exe
    "C:\Program Files (x86)\PrintFolders\obFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4456
  - - C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\sW7H8Al.exe
      4⤵
      Executes dropped EXE
      PID:716
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "obFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\obFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3540
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "obFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:3388

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

obFolders.exe

Path C:\Program Files (x86)\PrintFolders\obFolders.exe
Size 3.6MB
SHA256 70f7b3c762b4294aae87d32454c599523b1870eaa24419a215dc52570fded086
MD5 9cbf4fec4d0ae840f252fd7e6d25289e
SHA1 a4907730b3224a7b96646ece98cc2ad002c2fa3a
SHA512 3fe8f5c8f02d95e37a1a69fd204fa26a7519ab0fe45dfc2168068d7f0a2ca94511b045c562eb52b08b36f16019810ed345e0b5ca8677ee1dc2cdb61e93f7ac7b
SSDEEP 98304:uMQdvOBgmBtffka8qW1O95lEMz2WdHFXCPNJKbN8/0VS:VffkH/0VS
MD5 SHA1 SHA512 SSDEEP

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obFolders.exe

Path C:\Program Files (x86)\PrintFolders\obFolders.exe
Size 3.6MB
SHA256 70f7b3c762b4294aae87d32454c599523b1870eaa24419a215dc52570fded086
MD5 9cbf4fec4d0ae840f252fd7e6d25289e
SHA1 a4907730b3224a7b96646ece98cc2ad002c2fa3a
SHA512 3fe8f5c8f02d95e37a1a69fd204fa26a7519ab0fe45dfc2168068d7f0a2ca94511b045c562eb52b08b36f16019810ed345e0b5ca8677ee1dc2cdb61e93f7ac7b
SSDEEP 98304:uMQdvOBgmBtffka8qW1O95lEMz2WdHFXCPNJKbN8/0VS:VffkH/0VS
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-E3I9C.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-ST7TM.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-LBSB0.tmp\is-ST7TM.tmp
Size 759KB
SHA256 11ec35b1fea3160e892f0875034a2f18cf0d8d8874ac611b5a7e0f0ace2667ec
MD5 0dc8826072fc99382be7db6ae5929aff
SHA1 7ca23e146bf9bde712b27e400de3243e6bd0a357
SHA512 08db35c065b9b8f740242587f35a3c0ba772993d8132589fe26bafa9bab31d6c5aecae62490a22e135d64ce6b54c26e553534e5d9d6e01d6be8472f471bdf442
SSDEEP 12288:dh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvsZ6ZkkxOZ:D5NoqWolrP837JzHvA6yknyWFxvlZkkE
MD5 SHA1 SHA512 SSDEEP

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is-ST7TM.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-LBSB0.tmp\is-ST7TM.tmp
Size 759KB
SHA256 11ec35b1fea3160e892f0875034a2f18cf0d8d8874ac611b5a7e0f0ace2667ec
MD5 0dc8826072fc99382be7db6ae5929aff
SHA1 7ca23e146bf9bde712b27e400de3243e6bd0a357
SHA512 08db35c065b9b8f740242587f35a3c0ba772993d8132589fe26bafa9bab31d6c5aecae62490a22e135d64ce6b54c26e553534e5d9d6e01d6be8472f471bdf442
SSDEEP 12288:dh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvsZ6ZkkxOZ:D5NoqWolrP837JzHvA6yknyWFxvlZkkE
MD5 SHA1 SHA512 SSDEEP

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sW7H8Al.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\sW7H8Al.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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sW7H8Al.exe

Path C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\sW7H8Al.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/3140-151-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/3140-134-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/3140-132-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/3140-156-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/4456-142-0x0000000000400000-0x00000000015A5000-memory.dmp

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memory/4456-143-0x0000000000400000-0x00000000015A5000-memory.dmp

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memory/4456-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4456-152-0x0000000000400000-0x00000000015A5000-memory.dmp

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memory/4456-155-0x0000000000400000-0x00000000015A5000-memory.dmp

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