nymaim | 71bbe8c18610426bc0c8c949a2603343969641dc81917506f6e30b1396c3d44f

Analysis

max time kernel
152s
max time network
192s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
01/12/2022, 10:16

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General

Target
file.exe
Size 2.2MB
Sample221201-mavbnshb59
SHA256 71bbe8c18610426bc0c8c949a2603343969641dc81917506f6e30b1396c3d44f
MD5 d7473ff9a217364b0806846968c1a84c
SHA1 bde6ead1de378e397f2f966dc04b2f8bf30e3523
SHA512 d5d6b5f69e4d00052e2ad6f4757feb503115dc7649e0826daa975370ee74404f8f6f1abe637b93ef0164e74ffc286ba183d9dcfc79601909d599d8722660edb7
SSDEEP 49152:IuL3DhZ6jp/CqdfQOoX7/7x17NFWyizGjwiVtpSc9o8AG5cy0:IM3L2xjfn4DnWplSbSB8Xcy0
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
4884	is-EMSL6.tmp
4388	PrintFolders.exe
1452	8uIlNexxk.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
4884	is-EMSL6.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-T4TLK.tmp	is-EMSL6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-TK3T7.tmp	is-EMSL6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MMDTJ.tmp	is-EMSL6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-2Q8T2.tmp	is-EMSL6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-PSNEH.tmp	is-EMSL6.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-EMSL6.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\PrintFolders.exe	is-EMSL6.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-EMSL6.tmp
File created	C:\Program Files (x86)\PrintFolders\is-IMJDD.tmp	is-EMSL6.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
412	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4388	PrintFolders.exe
4388	PrintFolders.exe
4388	PrintFolders.exe
4388	PrintFolders.exe
4388	PrintFolders.exe
4388	PrintFolders.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4388	PrintFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	412	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3748 wrote to memory of 4884	3748	file.exe	79
PID 3748 wrote to memory of 4884	3748	file.exe	79
PID 3748 wrote to memory of 4884	3748	file.exe	79
PID 4884 wrote to memory of 4388	4884	is-EMSL6.tmp	82
PID 4884 wrote to memory of 4388	4884	is-EMSL6.tmp	82
PID 4884 wrote to memory of 4388	4884	is-EMSL6.tmp	82
PID 4388 wrote to memory of 1452	4388	PrintFolders.exe	83
PID 4388 wrote to memory of 1452	4388	PrintFolders.exe	83
PID 4388 wrote to memory of 1452	4388	PrintFolders.exe	83
PID 4388 wrote to memory of 1172	4388	PrintFolders.exe	90
PID 4388 wrote to memory of 1172	4388	PrintFolders.exe	90
PID 4388 wrote to memory of 1172	4388	PrintFolders.exe	90
PID 1172 wrote to memory of 412	1172	cmd.exe	92
PID 1172 wrote to memory of 412	1172	cmd.exe	92
PID 1172 wrote to memory of 412	1172	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3748
- C:\Users\Admin\AppData\Local\Temp\is-UTP8L.tmp\is-EMSL6.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-UTP8L.tmp\is-EMSL6.tmp" /SL4 $4002C "C:\Users\Admin\AppData\Local\Temp\file.exe" 2085654 51712
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:4884
- - 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 behavior: GetForegroundWindowSpam
    - Suspicious use of WriteProcessMemory
    PID:4388
  - - C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\8uIlNexxk.exe
      4⤵
      Executes dropped EXE
      PID:1452
  - - 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:1172
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "PrintFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:412

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 3.4MB
SHA256 5ed1c66173a1726b978e55d54e1bab3872ba78e218c75c620190e0d6f6d2ea9c
MD5 d828c0b62b515edcbc0ebfa93a48eefd
SHA1 cbac00152d3a05261d5014fe8107e0d4425c5268
SHA512 9977a860607eaa7390921c86db0214575933ea85558fffd2d79b0b9634195640cfb4e5bdfa91c4a32f2867b4cb2e36d8bf89eaf963d73058f2603f0c31e52b23
SSDEEP 24576:eF5o0LBQobXUd439mM9w8pUvyMD63uK10hy2w/UK6pjA+Ia7HSpIclCKc2a:ebHLBdbXF1V13urhhwcrAo7H+1MKDa
MD5 SHA1 SHA512 SSDEEP

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PrintFolders.exe

Path C:\Program Files (x86)\PrintFolders\PrintFolders.exe
Size 3.4MB
SHA256 5ed1c66173a1726b978e55d54e1bab3872ba78e218c75c620190e0d6f6d2ea9c
MD5 d828c0b62b515edcbc0ebfa93a48eefd
SHA1 cbac00152d3a05261d5014fe8107e0d4425c5268
SHA512 9977a860607eaa7390921c86db0214575933ea85558fffd2d79b0b9634195640cfb4e5bdfa91c4a32f2867b4cb2e36d8bf89eaf963d73058f2603f0c31e52b23
SSDEEP 24576:eF5o0LBQobXUd439mM9w8pUvyMD63uK10hy2w/UK6pjA+Ia7HSpIclCKc2a:ebHLBdbXF1V13urhhwcrAo7H+1MKDa
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

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

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is-EMSL6.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-UTP8L.tmp\is-EMSL6.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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is-EMSL6.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-UTP8L.tmp\is-EMSL6.tmp
Size 643KB
SHA256 b5cd942dd7019c1cda1715e4ce942094c41ad1e7bc7c5f63fe3ab7d97bc5a021
MD5 363a4d2aa5d6cf5cbb2267cccf0c4436
SHA1 a4cdb756698ed28f522956166a6292e9e309dd9c
SHA512 b5929be6e258a63557f376b50a40f6d465cbd372a88e7dcae7944faacb9181cd55873f52dee99cee2e3705596b3b55cb6f784db800f5a32f06e63b9ead3e7c70
SSDEEP 12288:Jh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv4xp:f5NoqWolrP837JzHvA6yknyWFxv4xp
MD5 SHA1 SHA512 SSDEEP

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8uIlNexxk.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\8uIlNexxk.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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8uIlNexxk.exe

Path C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\8uIlNexxk.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/3748-137-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3748-157-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/3748-132-0x0000000000400000-0x0000000000413000-memory.dmp

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memory/4388-143-0x0000000000400000-0x0000000001566000-memory.dmp

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memory/4388-145-0x0000000000400000-0x0000000001566000-memory.dmp

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memory/4388-149-0x0000000000400000-0x0000000001566000-memory.dmp

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memory/4388-150-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4388-144-0x0000000000400000-0x0000000001566000-memory.dmp

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memory/4388-156-0x0000000000400000-0x0000000001566000-memory.dmp

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memory/4388-142-0x0000000000400000-0x0000000001566000-memory.dmp

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