nymaim | 8a02f281295e90725380ea13094ca11eacf7d011bf24e362787c0c71fe4e7dbe

Analysis

max time kernel
90s
max time network
124s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
15/12/2022, 10:48

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General

Target
file.exe
Size 2.2MB
Sample221215-mv4e3scb68
SHA256 8a02f281295e90725380ea13094ca11eacf7d011bf24e362787c0c71fe4e7dbe
MD5 53adcb4d8fb4daacc7d4ec37eeb8a953
SHA1 0ae32f97256fc35c635a0f98f5f616dc2685ef76
SHA512 e9ac6e798b5e7fce3a662505543f4473faf37dbac8cf62d075891fe8da276fcc26c1e1d88d3011b71ae6b137ab81a76f3603bf62adb041e369894880ad4e9cfb
SSDEEP 49152:gNur/ObHiTM7OXeGYgmhEpDEChTOfaUm710u74oLlw2heOCgSY/V:gNy/uCXsh8DECNOg54aw2hcY/V
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
1276	is-HB20J.tmp
4184	nzFolders.exe
1012	kXtLNmn1.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-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	nzFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
1276	is-HB20J.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\unins000.dat	is-HB20J.tmp
File created	C:\Program Files (x86)\PrintFolders\is-EAV71.tmp	is-HB20J.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-HB20J.tmp
File created	C:\Program Files (x86)\PrintFolders\is-D4OTE.tmp	is-HB20J.tmp
File created	C:\Program Files (x86)\PrintFolders\is-GR2JK.tmp	is-HB20J.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\nzFolders.exe	is-HB20J.tmp
File created	C:\Program Files (x86)\PrintFolders\is-U524G.tmp	is-HB20J.tmp
File created	C:\Program Files (x86)\PrintFolders\is-ATJ7S.tmp	is-HB20J.tmp
File created	C:\Program Files (x86)\PrintFolders\is-Q1JA2.tmp	is-HB20J.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
3712	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4184	nzFolders.exe
4184	nzFolders.exe
4184	nzFolders.exe
4184	nzFolders.exe
4184	nzFolders.exe
4184	nzFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3712	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 828 wrote to memory of 1276	828	file.exe	82
PID 828 wrote to memory of 1276	828	file.exe	82
PID 828 wrote to memory of 1276	828	file.exe	82
PID 1276 wrote to memory of 4184	1276	is-HB20J.tmp	83
PID 1276 wrote to memory of 4184	1276	is-HB20J.tmp	83
PID 1276 wrote to memory of 4184	1276	is-HB20J.tmp	83
PID 4184 wrote to memory of 1012	4184	nzFolders.exe	86
PID 4184 wrote to memory of 1012	4184	nzFolders.exe	86
PID 4184 wrote to memory of 1012	4184	nzFolders.exe	86
PID 4184 wrote to memory of 4720	4184	nzFolders.exe	92
PID 4184 wrote to memory of 4720	4184	nzFolders.exe	92
PID 4184 wrote to memory of 4720	4184	nzFolders.exe	92
PID 4720 wrote to memory of 3712	4720	cmd.exe	94
PID 4720 wrote to memory of 3712	4720	cmd.exe	94
PID 4720 wrote to memory of 3712	4720	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:828
- C:\Users\Admin\AppData\Local\Temp\is-HIIUK.tmp\is-HB20J.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-HIIUK.tmp\is-HB20J.tmp" /SL4 $1101B8 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2071688 208896
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:1276
- - C:\Program Files (x86)\PrintFolders\nzFolders.exe
    "C:\Program Files (x86)\PrintFolders\nzFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4184
  - - C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\kXtLNmn1.exe
      4⤵
      Executes dropped EXE
      PID:1012
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "nzFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\nzFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4720
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "nzFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:3712

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

nzFolders.exe

Path C:\Program Files (x86)\PrintFolders\nzFolders.exe
Size 3.3MB
SHA256 a6b19b771d60a12069670705afbf4f24b6f109527be2cc38e81e37a19c4a3f9b
MD5 561a134748ec001e932cd94e2c4218e6
SHA1 3927df9fac70cb2ca9bb927e3fba310012865001
SHA512 7e56f313691de9a3578a93e5e431b17cf843751c9ad1462119dbe7b26bbd201e9699659d7dea3297db32160df4fbf310250dad84534f2362a1f7d3b2c7c1692a
SSDEEP 98304:2VAKKgjbWxfM+0w5luuwZ6fGuHr/dRrN1:w0fMIZ1
MD5 SHA1 SHA512 SSDEEP

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nzFolders.exe

Path C:\Program Files (x86)\PrintFolders\nzFolders.exe
Size 3.3MB
SHA256 a6b19b771d60a12069670705afbf4f24b6f109527be2cc38e81e37a19c4a3f9b
MD5 561a134748ec001e932cd94e2c4218e6
SHA1 3927df9fac70cb2ca9bb927e3fba310012865001
SHA512 7e56f313691de9a3578a93e5e431b17cf843751c9ad1462119dbe7b26bbd201e9699659d7dea3297db32160df4fbf310250dad84534f2362a1f7d3b2c7c1692a
SSDEEP 98304:2VAKKgjbWxfM+0w5luuwZ6fGuHr/dRrN1:w0fMIZ1
MD5 SHA1 SHA512 SSDEEP

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is-HB20J.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-HIIUK.tmp\is-HB20J.tmp
Size 797KB
SHA256 424fb4432fa651db203c38efd930813c49e90f506a7f5465347eff4eda44a711
MD5 fc4bab9305f2a869cb26d22e008f2921
SHA1 9871140128ea98e2cc798f3ef4c3cd546442969f
SHA512 bcaff0260b9cb2a6c3d7aabb7d1b1e02ca8968cdb0715f78db93755b44aa18e8f146b9052dc7fcf54796f044cf779cb989d34db8c17cf9eca53b30acfc708506
SSDEEP 24576:n5NoqWolrP837JzHvA6yknyWFxvSur/TxOu:njrP837JzHvA6pnvFxvSur/1p
MD5 SHA1 SHA512 SSDEEP

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is-HB20J.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-HIIUK.tmp\is-HB20J.tmp
Size 797KB
SHA256 424fb4432fa651db203c38efd930813c49e90f506a7f5465347eff4eda44a711
MD5 fc4bab9305f2a869cb26d22e008f2921
SHA1 9871140128ea98e2cc798f3ef4c3cd546442969f
SHA512 bcaff0260b9cb2a6c3d7aabb7d1b1e02ca8968cdb0715f78db93755b44aa18e8f146b9052dc7fcf54796f044cf779cb989d34db8c17cf9eca53b30acfc708506
SSDEEP 24576:n5NoqWolrP837JzHvA6yknyWFxvSur/TxOu:njrP837JzHvA6pnvFxvSur/1p
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-Q6JOS.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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kXtLNmn1.exe

Path C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\kXtLNmn1.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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kXtLNmn1.exe

Path C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\kXtLNmn1.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/828-156-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/828-138-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/828-132-0x0000000000400000-0x0000000000439000-memory.dmp

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memory/4184-143-0x0000000000400000-0x0000000001548000-memory.dmp

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memory/4184-144-0x0000000000400000-0x0000000001548000-memory.dmp

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memory/4184-148-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4184-152-0x0000000000400000-0x0000000001548000-memory.dmp

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memory/4184-142-0x0000000000400000-0x0000000001548000-memory.dmp

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memory/4184-155-0x0000000000400000-0x0000000001548000-memory.dmp

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