Behavioral task
behavioral1
Sample
BulkFileChanger.chm
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
BulkFileChanger.chm
Resource
win10v2004-20240412-en
Behavioral task
behavioral3
Sample
BulkFileChanger.exe
Resource
win7-20240221-en
Behavioral task
behavioral4
Sample
BulkFileChanger.exe
Resource
win10v2004-20240412-en
General
-
Target
bulkfilechanger.zip
-
Size
105KB
-
MD5
9170d27ecad3eaa70d7b56430597cfc6
-
SHA1
a6338948bf722bab2dc91309a532f0d830a4deea
-
SHA256
e718873d7bfa7f2d658c209756e64d002c2714d17dd55c71977eede5975a1e2d
-
SHA512
847788e8e4620bd90fa9c636ec40a70f6327f901553f268fbb3600ec8a4f099b604cb35eebbae2ccf3b125bf906a7b565b932a20f469a22580a836e6a8156708
-
SSDEEP
1536:dUHs9Mz81zs7Pd5nJ85oCmE9Y9ynvatx7DQHre49HNtWwZLRYbVxteic+H7:0MVa15J85oCm4a4sx4LegNtWwhR4tLJ
Malware Config
Signatures
-
Nirsoft 1 IoCs
resource yara_rule static1/unpack002/out.upx Nirsoft -
resource yara_rule static1/unpack001/BulkFileChanger.exe upx -
Unsigned PE 2 IoCs
Checks for missing Authenticode signature.
resource unpack001/BulkFileChanger.exe unpack002/out.upx
Files
-
bulkfilechanger.zip.zip
-
BulkFileChanger.chm.chm
-
BulkFileChanger.exe.exe windows:4 windows x86 arch:x86
Headers
File Characteristics
IMAGE_FILE_RELOCS_STRIPPED
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_32BIT_MACHINE
Sections
UPX0 Size: - Virtual size: 68KB
IMAGE_SCN_CNT_UNINITIALIZED_DATA
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
UPX1 Size: 41KB - Virtual size: 44KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
.rsrc Size: 4KB - Virtual size: 8KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
-
out.upx.exe windows:4 windows x86 arch:x86
Headers
File Characteristics
IMAGE_FILE_RELOCS_STRIPPED
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_32BIT_MACHINE
Sections
.text Size: 57KB - Virtual size: 57KB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rdata Size: 14KB - Virtual size: 13KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.data Size: 1024B - Virtual size: 5KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
.rsrc Size: 17KB - Virtual size: 17KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
-
readme.txt