nymaim | b79acdfed00406f7df83052d6b1f245b6f38ef36fdddff549942de3ec2484ea5

Analysis

max time kernel
91s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
19/12/2022, 00:17

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General

Target
file.exe
Size 2.3MB
Sample221219-ak2ghsdh96
SHA256 b79acdfed00406f7df83052d6b1f245b6f38ef36fdddff549942de3ec2484ea5
MD5 73caa30d19451662f501ce0192b90d21
SHA1 aa00bac28e5868767185259877b932b9dfcfc7ab
SHA512 a57e9a79f987376c90dfa5ff62561db845a55ad30bd86acc542cbcdbdf8d0ed3e2ac7f1bae8e2b7738a2f161a3e86e4f54a64b25b9de81fa5009ffeb3692f55d
SSDEEP 49152:x0PBNSF98TabR9Gx9ySYQZ3FN9EdZhB6jEr+7KRsf7O/d3H1:x0PBKO+bR9yAON2djMjEq7ayQV
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
644	is-DF1KS.tmp
1292	ocFolders.exe
1420	y3poGKUD.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	ocFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
644	is-DF1KS.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-MIO9O.tmp	is-DF1KS.tmp
File created	C:\Program Files (x86)\PrintFolders\is-N5N8R.tmp	is-DF1KS.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-DF1KS.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\ocFolders.exe	is-DF1KS.tmp
File created	C:\Program Files (x86)\PrintFolders\is-CP2MA.tmp	is-DF1KS.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-DF1KS.tmp
File created	C:\Program Files (x86)\PrintFolders\is-MJQQL.tmp	is-DF1KS.tmp
File created	C:\Program Files (x86)\PrintFolders\is-PRGVF.tmp	is-DF1KS.tmp
File created	C:\Program Files (x86)\PrintFolders\is-84KDS.tmp	is-DF1KS.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
976	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1292	ocFolders.exe
1292	ocFolders.exe
1292	ocFolders.exe
1292	ocFolders.exe
1292	ocFolders.exe
1292	ocFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	976	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2200 wrote to memory of 644	2200	file.exe	80
PID 2200 wrote to memory of 644	2200	file.exe	80
PID 2200 wrote to memory of 644	2200	file.exe	80
PID 644 wrote to memory of 1292	644	is-DF1KS.tmp	81
PID 644 wrote to memory of 1292	644	is-DF1KS.tmp	81
PID 644 wrote to memory of 1292	644	is-DF1KS.tmp	81
PID 1292 wrote to memory of 1420	1292	ocFolders.exe	85
PID 1292 wrote to memory of 1420	1292	ocFolders.exe	85
PID 1292 wrote to memory of 1420	1292	ocFolders.exe	85
PID 1292 wrote to memory of 4460	1292	ocFolders.exe	90
PID 1292 wrote to memory of 4460	1292	ocFolders.exe	90
PID 1292 wrote to memory of 4460	1292	ocFolders.exe	90
PID 4460 wrote to memory of 976	4460	cmd.exe	92
PID 4460 wrote to memory of 976	4460	cmd.exe	92
PID 4460 wrote to memory of 976	4460	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:2200
- C:\Users\Admin\AppData\Local\Temp\is-FU4U8.tmp\is-DF1KS.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-FU4U8.tmp\is-DF1KS.tmp" /SL4 $40056 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2142319 169984
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:644
- - C:\Program Files (x86)\PrintFolders\ocFolders.exe
    "C:\Program Files (x86)\PrintFolders\ocFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:1292
  - - C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\y3poGKUD.exe
      4⤵
      Executes dropped EXE
      PID:1420
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "ocFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\ocFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4460
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "ocFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:976

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

ocFolders.exe

Path C:\Program Files (x86)\PrintFolders\ocFolders.exe
Size 3.6MB
SHA256 b0599b550c1df6c9146e8d37a2f59de291d2883a8da47c556dad68fb93c9aeea
MD5 29002c51fd91a9902d8e606f044b3ea9
SHA1 44c2557b6bd949c23f3c94c6e82baf6070de21ce
SHA512 88e86489287db12fc28a24de6b63c61ef1bacef1018cf2796b2689eb6cbb63790efd1b2a671ec0829089e4ba88397cd891e4837e117f7e1244a2d7995090c228
SSDEEP 98304:At9dhXqF4xffhPBJ2HmmbRrxw/SnRVDnX:wxff16MWRJX
MD5 SHA1 SHA512 SSDEEP

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ocFolders.exe

Path C:\Program Files (x86)\PrintFolders\ocFolders.exe
Size 3.6MB
SHA256 b0599b550c1df6c9146e8d37a2f59de291d2883a8da47c556dad68fb93c9aeea
MD5 29002c51fd91a9902d8e606f044b3ea9
SHA1 44c2557b6bd949c23f3c94c6e82baf6070de21ce
SHA512 88e86489287db12fc28a24de6b63c61ef1bacef1018cf2796b2689eb6cbb63790efd1b2a671ec0829089e4ba88397cd891e4837e117f7e1244a2d7995090c228
SSDEEP 98304:At9dhXqF4xffhPBJ2HmmbRrxw/SnRVDnX:wxff16MWRJX
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-5SDJQ.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-DF1KS.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-FU4U8.tmp\is-DF1KS.tmp
Size 759KB
SHA256 2d4703dac05e8e6d136a8173f84d2618b54b6e7ef44ae5557350614bbb5a9797
MD5 d35c838e416f6a317c90117cc834b92b
SHA1 289a030cc78131163a8d6bc3c5dd831ac0f962a1
SHA512 9a50f934c199b4415911cae873cebd46f682526290b41a42a882a580fed67c99f5248abfbaa367f20b471564b4cf6d62f28ed2c945206267b37788f94377f167
SSDEEP 12288:dh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv+PBexOi:D5NoqWolrP837JzHvA6yknyWFxv+PBeH
MD5 SHA1 SHA512 SSDEEP

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is-DF1KS.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-FU4U8.tmp\is-DF1KS.tmp
Size 759KB
SHA256 2d4703dac05e8e6d136a8173f84d2618b54b6e7ef44ae5557350614bbb5a9797
MD5 d35c838e416f6a317c90117cc834b92b
SHA1 289a030cc78131163a8d6bc3c5dd831ac0f962a1
SHA512 9a50f934c199b4415911cae873cebd46f682526290b41a42a882a580fed67c99f5248abfbaa367f20b471564b4cf6d62f28ed2c945206267b37788f94377f167
SSDEEP 12288:dh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrv+PBexOi:D5NoqWolrP837JzHvA6yknyWFxv+PBeH
MD5 SHA1 SHA512 SSDEEP

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y3poGKUD.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\y3poGKUD.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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y3poGKUD.exe

Path C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\y3poGKUD.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/1292-143-0x0000000000400000-0x000000000158D000-memory.dmp

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memory/1292-142-0x0000000000400000-0x000000000158D000-memory.dmp

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memory/1292-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/1292-151-0x0000000000400000-0x000000000158D000-memory.dmp

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memory/1292-154-0x0000000000400000-0x000000000158D000-memory.dmp

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memory/2200-132-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/2200-137-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/2200-155-0x0000000000400000-0x0000000000430000-memory.dmp

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